What Climate Crisis Will Do to 3 Major American Cities by 2100
By Allegra Kirkland, Jeremy Deaton, Molly Taft, Mina Lee and Josh Landis
Climate change is already here. It's not something that can simply be ignored by cable news or dismissed by sitting U.S. senators in a Twitter joke. Nor is it a fantastical scenario like The Day After Tomorrow or 2012 that starts with a single crack in the Arctic ice shelf or earthquake tearing through Los Angeles, and results, a few weeks or years later, in the end of life on Earth as we know it.
Instead, we are seeing its creeping effects now — with hurricanes like Maria and Harvey that caused hundreds of deaths and billions of dollars in economic damage; with the Mississippi River and its tributaries overflowing their banks this spring, leaving huge swaths of the Midwestern plains under water. Climate change is, at this very moment, taking a real toll on wildlife, ecosystems, economies, and human beings, particularly in the global south, which experts expect will be hit first and hardest. We know from the increasingly apocalyptic warnings being issued by the United Nations that it will only get worse.
But these early omens of our unstable, hot, wet future can be difficult to wrap our heads around. So Teen Vogue partnered with the team at the nonprofit news service Nexus Media, who developed a timeline predicting how climate change could affect three major U.S. cities over the course of the 21st century. Climate change will look different in different places across the world, but we chose three places with distinct geographic concerns and climate vulnerabilities — to ground all the ominous statistics and headlines in a real sense of place. These are cities you may have visited, or where you may have family, or where you may even live.
According to the research Nexus compiled, St. Louis will see flooding, extreme heat, severe rainfall, and drought in the surrounding farmland. In Houston, on the Gulf of Mexico, hurricanes will grow more destructive and temperatures will soar. San Francisco will witness rising sea levels, fierce wildfires, and extreme drought.
This timeline is based on interviews with a dozen climate experts and a review of several dozen scientific studies. The projections assume an average sea level rise of six feet by 2100 — a little more in some places, and less in others — and the business-as-usual emissions scenario, which assumes that we will continue to pollute and use fossil fuels at our current rate.
Rather than a scientific assessment, it is a rigorously researched prediction of what our future could bring unless we come together as a country and as a global community — fast— to address climate change as the crisis it is.
As Katharine Hayhoe, a climate scientist at Texas Tech University, put it: "The future is not set in stone. Some amount of change is inevitable. It's as if we've been smoking a pack of cigarettes a day for decades, but we don't have lung cancer yet."
"The amount of change that we're going to see — whether it's serious, whether it's dangerous, whether it's devastating, whether it's civilization-threatening — the amount of change we're going to see is up to us," she continued. "It depends on our choices today and in the next few years."
It's starting to get hot. It's now about one degree Fahrenheit warmer in Houston than it was in the second half of the 20th century. Houstonians can expect especially balmy falls this decade, as autumns are warming faster than other seasons in Texas.
Houston knows how much it stands to lose from climate change. In 2017, Hurricane Harvey devastated the city, which was supercharged by warm waters in the Gulf. But Houston is also helping to drive the rise in temperature. Several major oil companies and a vast network of oil refineries and petrochemical plants call the city home.
This decade, St. Louis is expected to be more than two degrees Fahrenheit warmer than it was, on average, during the latter half of the 20th century. While locals have endured more sweltering summer days, they have felt the change the most during the cold months. Missouri winters are warming faster than summers, springs, and falls.
Warmer air holds more water, which can lead to more severe rainfall. In recent years, rainstorms have pummeled the Midwest and led to widespread flooding across the region. In 2019 in St. Louis, rivers reached near-historic levels, and floodwaters inundated the area around the city's iconic Gateway Arch.
For San Franciscans, the beginning of the decade will feel only a little different from past years. In 2020, it's expected to be less than one degree Fahrenheit warmer in San Francisco than it was, on average, between 1950 and 2000. The change is small, but locals can sometimes feel it in the spring, which is warming faster than the other seasons, or on especially hot days.
But there are new worries for the city. Rising temperatures have fueled ongoing drought in recent years, which has, in turn, led to more wildfires. Fires now burn more regularly across the Sierra Nevada as well as coastal mountain ranges. The flames may ruin plans for weekend getaways to Yosemite or deliver noxious smoke to the Bay Area. And locals may start to reach for air masks as dangerously smoky days become more common.
"We get a lot of the smoke that comes from the wildfires that happen in inland California, and that makes it really hard to breathe the air," said Kristy Dahl, a climate scientist at the Union of Concerned Scientists, who is based in San Francisco. "Last year when there was a massive wildfire hundreds of miles away, San Francisco for a day [ranked among] the worst air quality in the entire world."
By 2030, temperatures are expected to have warmed almost two degrees Fahrenheit in Houston. Seas are expected to have risen a little more than a foot, enough to occasionally flood some low-lying areas outside the city. Warmer waters in the Gulf of Mexico will raise the speed limit for winds during hurricanes and ramp up rainfall during storms.
"Hurricanes are not getting more frequent, but they are getting stronger and bigger and slower," said Katharine Hayhoe, a climate scientist at Texas Tech University. "They're intensifying faster and they have a lot more rain associated with them today than they would have had a hundred years ago."
By 2030, temperatures are expected to have warmed around three degrees Fahrenheit in St. Louis. The kind of rainstorm that currently strikes the Midwest around once every five years will hit around once every three years this decade.
"We've seen these record-breaking, devastating floods in the Midwest," said Katharine Hayhoe, a climate scientist at Texas Tech University. "It's not like they've never had floods before, but the floods are just getting a lot worse and a lot more frequent."
This could mean trouble for local infrastructure. Rivers swell after heavy rains, and the rush of water can weaken bridges by carrying away sediment from around their foundations. This could be a big problem in Missouri, which is home to hundreds of aging bridges, many of which have been deemed deficient. Climate change could mean even more heavy repair costs for taxpayers.
This decade, the rise in temperature is expected to pass two degrees Fahrenheit in San Francisco. That may not feel like a lot in the city. But warmer weather is taking a serious toll.
California's drought will get progressively worse this decade, the product of warmer temperatures drying out soil and meager rainfall failing to replace the water lost. Rising temperatures will also yield less snowfall. The snow that does come down will melt in the spring and early summer, depriving the state of a critical source of water in the late summer, when, historically, melting snow has fed streams and rivers.
The snow drought will strain farmers in the Central Valley, while putting pressure on cities to use less water. The water restrictions the state put in place in 2018 will have grown much more severe in the past 12 years. Officials could urge Californians across the state to take shorter showers and stop watering their lawns to cope with the worsening drought.
This decade, sea level rise around Houston is projected to reach two feet, enough to inundate much of nearby Freeport and Jamaica Beach. That extra water will mean that hurricanes, when they strike, will deliver more powerful floods to coastal areas.
"A small and steady rise of the water level elevates a platform for flooding that we've had throughout history," said Maya Buchanan, a sea level rise scientist at Climate Central. "That means larger storm surges."
That's bad news for people who live near the shore. Around half of deaths caused by hurricanes are the result of coastal flooding, and waters tend to inundate poor neighborhoods and neighborhoods of color, which are more likely to lie in flood-prone areas.
In 2040, St. Louis is expected to be four degrees Fahrenheit warmer than it was at the end of the last century. While that may sound like a small number, it means big problems for the city. A small uptick in the average temperature could lead to milder winters, stifling summers and changing rainfall.
St. Louis will tend to see wetter springs and drier summers. That means the region will withstand heavier downpours, but it will also endure long stretches without a drop of rain. Despite the growing peril of major flooding, extended dry spells and rising temperatures will dry out the land. Drought will set in in Missouri, endangering farms.
And just remember — it will never be this cool again.
By 2040, sea levels are predicted to rise around one foot, enough to encroach the beaches on the west side of the city and Candlestick Point on the east, popular recreation areas. Parts of San Francisco Airport and Oakland Airport will flood regularly, making air travel in and out of the city more difficult.
Drought will have grown increasingly severe. Forests will dry out, and become vulnerable to bark beetles, which burrow into trees to lay their eggs. Healthy trees can ward off the bugs by covering them in resin — but already struggling trees have no way to protect themselves.
Large parts of forests will die, and the dead trees will become tinder for wildfire. In 2040, fires are expected to burn around twice as much big sections of the Sierra Nevada as they do today. Areas south of San Francisco will also grow more vulnerable to erupting in flames.
By midcentury, temperatures are expected to have warmed more than three degrees Fahrenheit in Houston. Waters in the Gulf of Mexico will have also warmed, fueling more dangerous storms.
In the decades to come, the Gulf will see more category-four and -five hurricanes, like Hurricane Harvey and Hurricane Katrina, according to Suzana Camargo, a climate scientist at Columbia University. Warm water is like ammunition for cyclones, arming them with more powerful winds and heavier rains. People might want to think twice before they purchase a home in Houston.
"I think people have to think very carefully how they are going to plan when they want to buy a house," Camargo said, explaining that in the future, cyclones will deliver more flooding to seaside cities and towns.
St. Louis is expected to have heated up by more than five degrees Fahrenheit on average by the middle of the century. Hot weather will dry out soil. Past 2050, the Central Plains, including much of Missouri, can look forward to decades-long drought.
This drought will be especially disastrous for Missouri farmers. Growers will have to take more water out of underground aquifers to feed their crops, drawing down a limited supply of groundwater, often at great cost. This, in turn, could drive up the price of food.
By 2050, temperatures in San Francisco are expected to have risen more than three degrees Fahrenheit. In the second half of this century, changing weather patterns will yield lasting dry spells, leaving much of California to endure long stretches without rain. Around the time someone graduating high school today turns 50, they can expect California to enter a decades-long drought — with disastrous consequences.
Farmers in California will have to draw more and more water from underground. Eventually, they may not be able to grow fruits and vegetables in parts of the state. This will drive up the cost of many foods, such as strawberries, almonds, and lemons.
Snow will also start to disappear from the Sierra Nevada. By 2050, projections say, there will be a third less snow than we see today. San Francisco depends on that snow for its water, and a dry Sierra Nevada could mean a looming water crisis for the city.
The drought will also leave California's forests all the more vulnerable to wildfire — fires that could cover San Francisco in smoke, making it dangerous to go outside.
Where San Francisco residents are expected to move when they're displaced by rising seas..
Local sea level rise, meanwhile, is expected reach three feet during this decade. This will raise the level of Buffalo Bayou, the waterway that stretches through the middle of Houston. The Scholes International Airport in nearby Galveston will sink into the sea, and at high tide, water will flood much of the San Jacinto Battleground, site of the 1836 clash where Sam Houston, the city's namesake, overcame the Mexican Army.
St. Louis is expected hit a six-degrees-Fahrenheit increase in its average temperature this decade. While this might be bad news for humans, it's good for many insects, who love warm weather. Rising temperatures will bring disease-carrying mosquitoes to St. Louis's doorstep. Missourians will have to be more vigilant about their health as the bugs could spread tropical viruses like Zika, dengue, and yellow fever around the warming Midwest.
Climate change will also bring more deer ticks to St. Louis. Because warmer air can hold more water, as temperatures rise, so does humidity — and deer ticks thrive in humid weather. While ticks are little seen in Missouri today, later this century they will fan out across the state, potentially spreading Lyme disease. Those afflicted will endure fever, headache, and fatigue. They may see their joints swell or feel their face droop.
By 2060, temperatures in San Francisco are expected to have risen by more than four degrees Fahrenheit.
Wildfires will burn roughly three times as much of broad swaths of the Sierra Nevada as they do today, laying waste to large stretches of California's pristine forests.
This decade, sea level rise is projected hit two feet. Water will begin to spill over the edges of the Mission Creek Channel, while threatening routine floods around San Francisco's iconic Fisherman's Wharf. Waters will have flooded much of nearby San Rafael, north of San Francisco. To the south, Foster City will be underwater, displacing thousands of residents — many of whom currently work in the tech industry.
By 2070, Houston is projected to be more than five degrees Fahrenheit hotter than at the end of the 20th century. This warming is part of a larger trend that is heating up the planet and melting ice in Greenland and Antarctica, raising the sea level near the city.
"As flooding events get more severe, that can impact property values, and that could impact where people decide to live," Buchanan said, explaining that rising seas will drive down the value of homes in low-lying areas.
By this time, waters will have already subsumed much of the coastline from Freeport, south of Houston, all the way to New Orleans. Rising seas will make much of the Gulf coast unrecognizable as the ocean swallows up most of southern Louisiana. Later this decade, sea levels are expected to have risen by four feet.
In 2070, St. Louis is projected to be more than seven degrees Fahrenheit hotter than it was at the end of the last century. Before the decade is through, the city is expected to see eight degrees Fahrenheit of warming. Rising temperatures will have utterly transformed the weather in Missouri, making it virtually unrecognizable to current residents. The city will see around 20 fewer days of frost each year than it does today, as well as around 20 extra days with temperatures over 95 degrees Fahrenheit. The heat will be felt most acutely in neighborhoods short on trees and parks.
Outside the city, severe heat will cripple the growth of corn and soybeans at nearby farms. So will drought, which experts say will be worse than at any time in living memory. The state will endure more consecutive days without rain. When it does rain, however, it will pour. Warmer temperatures will produce more extreme rainfall.
By 2070, San Francisco's average temperature is expected to have warmed by more than five degrees Fahrenheit. Drought will be more severe than at any time in living memory. Rising temperatures and diminished rainfall will take a toll on trees around the San Francisco Bay. More and more evergreen forests will die off and grasslands will spring up in their place, fundamentally changing the landscape around the city.
This is what Houston, St. Louis, and San Francisco will feel like in 2080.
By 2080, temperatures are projected to have warmed around six degrees Fahrenheit on average, a dizzying change in the weather that means Houston won't feel like Houston anymore.
The city will grow warmer and wetter. Around 2080, Houston will feel something like Ciudad Mante in Mexico does today, with its warmer, drier winter.
As the climate changes, Houston's native wildlife could start to head north. At the same time, plants and animals that currently make their home south of Houston may start to work their way toward the city.
St. Louis is expected to be nearly nine degrees Fahrenheit warmer by 2080. The temperature will have changed so drastically that St. Louis no longer feels like the same city.
Around 2080, St. Louis will start to feel like Prosper, Texas, does today. This new St. Louis will be hotter and drier. Summer weather will go from balmy to sweltering, and the city will see much less rain during the warm months.
It's not just that St. Louis will feel more like Prosper. It might start to look like it too. Animals that currently live around Prosper could head northward as the climate changes, searching for a new home that feels like their old one. At the same time, the shrubs and grasslands that stretch across north Texas could start to edge their way toward Missouri.
By 2080, the average temperature is expected to have risen by more than six degrees Fahrenheit in San Francisco. The city will start to feel a lot like present-day Los Angeles. The weather will be warmer and drier, much like the current climate in Palos Verdes Estates, a coastal city in the L.A. area.
With less rainfall, many of the trees that make their home in San Francisco will die. At the same time, the smaller, scrubbier plants that make their home in L.A. could migrate toward the city. It's not just that San Francisco will start to feel like L.A., scientists say. It might start to look like it too.
By now, temperatures are projected to have warmed close to seven degrees Fahrenheit, while sea levels will have risen five feet, subsuming the coastline. Much of nearby Galveston is underwater.
It's not just hot days that threaten Houston. Rising temperatures will allow the air to hold more water, increasing humidity — which could be a big problem for public health.
"As humidity rises, it becomes harder and harder for the sweat to evaporate off our skin — and it's that evaporation of sweat that cools our bodies," said Kristy Dahl, a climate scientist at the Union of Concerned Scientists. "So it might only be a temperature reading of 90 degrees, but if you have 60% humidity, it's going to feel hotter than 90 degrees."
Dahl said that Houston will heat up so much that it will be hard to quantify how hot it will feel.
"By the end of the century, Houston would see about three weeks of what we call off-the-charts heat conditions, which are when the combination of temperature and humidity falls above the national weather services heat index scale," she said. "What that means is that we can't even calculate a heat index to reliably warn people about how dangerous it is."
St. Louis is expected to have warmed by almost 10 degrees Fahrenheit, a transformational change in the climate of the city. Rising temperatures could provoke a spike in violent crime — when people are hot, research shows, they tend to feel more aggressive.
By the end of the century, St. Louis will endure around 80 days per year where the heat index is above 100 degrees — compared to just 11 days at the end of the 20th century, according to Kristy Dahl, a climate scientist at the Union of Concerned Scientists.
"It's really striking because historically those off-the-charts conditions have only occurred in the Sonoran desert region of the U.S., the California-Arizona border," Dahl said.
In addition to extreme heat, the city will also endure severe drought, punctuated by the occasional supercharged rainstorm. The kind of downpour that currently strikes the Midwest around once every five years will hit around once every year or two. The most severe storms — the kind that currently show up once every 20 years — now arrive once every six or seven years.
Heavy rainfall will lead to flooding, and floodwaters will mix with raw sewage, helping to spread bacteria. Rains will also swamp homes and businesses, offering a place for mold to grow.
By now, San Francisco is projected to have heated up more than seven degrees Fahrenheit on average. The extra heat will mean many people will be spending more time outdoors, potentially leading to a spike in violent crime.
The state will be mired in lasting drought. Wildfires could consume around four times as much of huge sections of the Sierra Nevada as they do today, as well as forests closer to San Francisco, endangering locals.
The Bay Area is expected to have seen more than three feet of sea level rise. The San Francisco and Oakland Airports will be completely underwater. Across the bay, coastal flooding will inundate parts of Alameda. Low-lying areas on the south end of the San Francisco Bay will also be flooded, including some of San Jose.
By the end of this century, temperatures are expected to have warmed close to eight degrees Fahrenheit in Houston. In the summer, Houston will feel something like Jeddah, Saudi Arabia, does today. High temperatures will average over 100 degrees Fahrenheit during the warmest months.
By making life harder for workers, severe hotter weather will shrink the economy of the greater Houston area by 6%. Extreme heat will also kill hundreds more people each year. Poorer neighborhoods tend to be warmer, in part because they tend to have fewer trees. People who live in those neighborhoods are also less likely to have air conditioners, which will put them at greater risk.
On top of the heat, Houston is expected to have seen close to six feet of sea level rise by 2100. Waters encroach on the east side of town near the water, where oil refineries and chemical plants could continue to service our catastrophic addiction to oil and gas. Routine flooding of these facilities may cause dangerous explosions and potentially release toxic chemicals into the air.
Much of the city, however, will stay safe from the encroaching sea. That means the Houston could absorb hundreds of thousands of new residents by 2100 — people who were driven from Miami and New Orleans by ever-worsening coastal floods.
By the end of this century, St. Louis is expected to have warmed by roughly 11 degrees Fahrenheit. Winter will scarcely look like winter. Summers will have gone from hot to unbearable.
During the hottest months, it will be so scorching that it will be dangerous to go outside for much of the day. People will depend more on air conditioners to stay cool, leading to bigger electric bills. Elderly people, particularly those who can't afford to run an air conditioner, will face the risk of heat stroke and death.
The intense heat will take an immense toll on the local economy. Farms in Missouri and southern Illinois could see yields cut in half, ruining livelihoods.
In St. Louis itself, experts project that heat will stifle productivity by making it too hot to work. This could help cut the city's economic output by around 8%.
By 2100, San Francisco is expected to have heated up by more than eight degrees Fahrenheit on average. It will be hot and dry. Snow will be hard to find in the Sierra Nevada. By 2100, the mountain range will see two thirds less snow than we see today, depriving San Francisco of a much-needed water source.
Seas will have risen four feet, projections say. Large parts of Alameda will be underwater. Hunters Point will have flooded, as well as much of Mission Bay. And flooding won't be limited to San Francisco.
Sea level rise could flood the homes of 13 million Americans by the end of the century, leading to a massive exodus from many coastal areas. By one estimate, rising seas in places like Oakland, Alameda, and San Mateo could spur close to 300,000 residents to move to inland cities in Arizona, Texas, and New Jersey. It is the poorest neighborhoods that will be the most vulnerable to floods.
Note: This story is based on RCP 8.5, the so-called "business-as-usual" emissions scenario that assumes that Earth will continue to heavily rely on fossil fuels as the global economy grows. Per Nexus Media, "As we are currently doing virtually nothing to stop climate change, RCP 8.5 is a pretty good predictor of what's going to happen over the next couple of decades. Part of that is because it will take a while for the climate to reach a new equilibrium, so even if we stopped polluting now, the planet would continue to warm for decades." It looks at a sea level rise of six feet, on average, globally, based on the findings of this widely-cited 2014 study.
This story originally appeared in Teen Vogue in partnership with Nexus Media. It is republished here as part of EcoWatch's partnership with Covering Climate Now, a global collaboration of more than 250 news outlets to strengthen coverage of the climate story.
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By James Shulmeister
Climate Explained is a collaboration between The Conversation, Stuff and the New Zealand Science Media Centre to answer your questions about climate change.
If you have a question you'd like an expert to answer, please send it to firstname.lastname@example.org
What was the climate and sea level like at times in Earth’s history when carbon dioxide in the atmosphere was at 400ppm?<p>The last time global carbon dioxide levels were consistently at or above 400 parts per million (ppm) was around <a href="https://www.nature.com/articles/nature14145" target="_blank">four million years ago</a> during a geological period known as the <a href="http://www.geologypage.com/2014/05/pliocene-epoch.html" target="_blank">Pliocene Era</a> (between 5.3 million and 2.6 million years ago). The world was about 3℃ warmer and sea levels were higher than today.</p><p>We know how much carbon dioxide the atmosphere contained in the past by studying ice cores from Greenland and Antarctica. As compacted snow gradually changes to ice, it traps air in bubbles that contain <a href="https://www.cambridge.org/core/journals/annals-of-glaciology/article/enclosure-of-air-during-metamorphosis-of-dry-firn-to-ice/09D9C60A8DA412D16645E6E6ABC1892F" target="_blank">samples of the atmosphere at the time</a>. We can sample ice cores to reconstruct past concentrations of carbon dioxide, but this record only takes us back about a million years.</p><p>Beyond a million years, we don't have any direct measurements of the composition of ancient atmospheres, but we can use several methods to estimate past levels of carbon dioxide. One method uses the relationship between plant pores, known as stomata, that regulate gas exchange in and out of the plant. The density of these stomata is <a href="https://journals.sagepub.com/doi/abs/10.1177/095968369200200109" target="_blank">related to atmospheric carbon dioxide</a>, and fossil plants are a good indicator of concentrations in the past.</p><p>Another technique is to examine sediment cores from the ocean floor. The sediments build up year after year as the bodies and shells of dead plankton and other organisms rain down on the seafloor. We can use isotopes (chemically identical atoms that differ only in atomic weight) of boron taken from the shells of the dead plankton to reconstruct changes in the acidity of seawater. From this we can work out the level of carbon dioxide in the ocean.</p><p>The data from four-million-year-old sediments suggest that <a href="https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2010PA002055" target="_blank">carbon dioxide was at 400ppm back then</a>.</p>
Sea Levels and Changes in Antarctica<p>During colder periods in Earth's history, ice caps and glaciers grow and sea levels drop. In the recent geological past, during the most recent ice age about 20,000 years ago, sea levels were at least <a href="https://science.sciencemag.org/content/292/5517/679.abstract" target="_blank">120 meters lower</a> than they are today.</p><p><span></span>Sea-level changes are calculated from changes in isotopes of oxygen in the shells of marine organisms. For the Pliocene Era, <a href="https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2004PA001071" target="_blank">research</a> shows the sea-level change between cooler and warmer periods was around 30-40 meters and sea level was higher than today. Also during the Pliocene, we know the West Antarctic Ice Sheet was <a href="https://www.nature.com/articles/nature07867" target="_blank">significantly smaller</a> and global average temperatures were about 3℃ warmer than today. Summer temperatures in high northern latitudes were up to 14℃ warmer.</p><p>This may seem like a lot but modern observations show strong <a href="https://journals.ametsoc.org/jcli/article/23/14/3888/32547" target="_blank">polar amplification</a> of warming: a 1℃ increase at the equator may raise temperatures at the poles by 6-7℃. It is one of the reasons why Arctic sea ice is disappearing.</p>
Impacts in New Zealand and Australia<p>In the Australian region, there was no Great Barrier Reef, but there may have been <a href="https://link.springer.com/content/pdf/10.1007/BF02537376.pdf" target="_blank">smaller reefs along the northeast coast of Australia</a>. For New Zealand, the partial melting of the West Antarctic Ice Sheet is probably the most critical point.</p><p>One of the key features of New Zealand's current climate is that Antarctica is cut off from global circulation during the winter because of the big <a href="https://www.tandfonline.com/doi/abs/10.3402/tellusa.v54i5.12161" target="_blank">temperature contrast</a> between Antarctica and the Southern Ocean. When it comes back into circulation in springtime, New Zealand gets strong storms. Stormier winters and significantly warmer summers were likely in the mid-Pliocene because of a weaker polar vortex and a warmer Antarctica.</p><p>It will take more than a few years or decades of carbon dioxide concentrations at 400ppm to trigger a significant shrinking of the West Antarctic Ice Sheet. But recent studies show that <a href="http://nora.nerc.ac.uk/id/eprint/521027/" target="_blank">West Antarctica is already melting</a>.</p><p>Sea-level rise from a partial melting of West Antarctica could easily exceed a meter or more by 2100. In fact, if the whole of the West Antarctic melted it could <a href="http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.695.7239&rep=rep1&type=pdf" target="_blank">raise sea levels by about 3.5 meters</a>. Even smaller increases raise the risk of <a href="https://www.pce.parliament.nz/publications/preparing-new-zealand-for-rising-seas-certainty-and-uncertainty" target="_blank">flooding in low-lying cities</a> including Auckland, Christchurch and Wellington.</p>
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By Jo Harper
Investment in U.S. offshore wind projects are set to hit $78 billion (€69 billion) this decade, in contrast with an estimated $82 billion for U.S. offshore oil and gasoline projects, Wood Mackenzie data shows. This would be a remarkable feat only four years after the first offshore wind plant — the 30 megawatt (MW) Block Island Wind Farm off the coast of Rhode Island — started operating in U.S. waters.
Corporates Shift<p>Helping to drive offshore growth, U.S. corporate buyers <a href="https://www.dw.com/en/cities-leading-the-transition-to-renewables/a-42850621" target="_blank">are increasingly relying on wind energy to power their businesses</a>. Walmart and AT&T are the two top corporate wind buyers, while 14 newcomers entered the wind market in 2019, including Estée Lauder and McDonald's.</p><p>"Oil and gas companies have jumped into the U.S. offshore wind market, where they can transfer expertise in offshore fossil fuel development to clean energy investments," says Max Cohen, principal analyst, Americas Power & Renewable research at Wood Mackenzie. Many international oil and gas companies have already recognized this huge potential and entered the US offshore wind market, including Orsted, Equinor and Shell.</p><p>"Given the recent tumult in oil prices, fossil fuel companies may more and more be looking to diversify their portfolios, particularly with assets that are contracted or offer returns uncorrelated with oil and gas," Cohen says. "Offshore wind is an area where they may have a comparative advantage, and they can then leverage the experience with that technology to make the leap to onshore wind, solar, and other renewable technologies," he says.</p>
East Coast leads the way<p>"There is enormous opportunity, especially off the East Coast, for wind. I am very bullish," said former Interior Secretary Ryan Zinke. "Market excitement is moving towards offshore wind. I haven't seen this kind of enthusiasm from industry since the Bakken shale boom," he said.</p><p>Offshore wind initiatives require excessive upfront spending: a 250 MW venture costs about $1 billion, based on International Energy Agency data, but as costs fall the tipping point after which costs fall faster gets nearer</p><p>"The opportunity has been created by Northeastern states seeing the large price declines for offshore wind in Europe," says Cohen. Onshore wind is historically the lowest cost renewable resource, but is at its most expensive in the Northeast, he adds. "But costs are falling slower than for other technologies," he says.</p>
Jobs and Coastal Revitalization<p>U.S. wind energy now supports 120,000 US jobs and 530 domestic factories. A study by the University of Delaware predicted that the supply chain needed to build offshore turbines to feed power to seven East Coast states by 2030 would generate nearly $70 billion in economic activity and at least 40,000 full-time jobs. An American Wind Energy Association's (AWEA's) March 2020 report estimated that developing 30,000 MW of offshore wind along the East Coast could support up to 83,000 jobs and $25 billion in annual economic output by 2030.</p><p>Having said that, not all of the jobs are American jobs. The offshore wind developers with commercial leases in the US are all foreign companies. There is growing interest from the shipbuilding sector in the Gulf of Mexico in partnering with offshore wind companies to provide services. As a result, some of the US oil trade associations have submitted comments supporting certain aspects of offshore wind. "However, it is unclear to what extent offshore wind developers plan to use US vessels and crew, and the existing projects did not incorporate US vessels or labor at all," Hawkins says.</p>
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The COVID-19 pandemic has revealed both the strengths and limitations of globalization. The crisis has made people aware of how industrialized food production can be, and just how far food can travel to get to the local supermarket. There are many benefits to this system, including low prices for consumers and larger, even global, markets for producers. But there are also costs — to the environment, workers, small farmers and to a region or individual nation's food security.
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By Joe Leech
The human body comprises around 60% water.
It's commonly recommended that you drink eight 8-ounce (237-mL) glasses of water per day (the 8×8 rule).
1. Helps Maximize Physical Performance<p>If you don't stay hydrated, your physical performance can suffer.</p><p>This is particularly important during intense exercise or high heat.</p><p>Dehydration can have <a href="https://www.healthline.com/health/how-to-tell-if-youre-dehydrated" target="_blank">a noticeable effect</a> if you lose as little as 2% of your body's water content. However, it isn't uncommon for athletes to lose as much as 6–10% of their water weight via sweat.</p><p>This can lead to altered body temperature control, reduced motivation, and increased fatigue. It can also make exercise feel much more difficult, both physically and mentally.</p><p>Optimal hydration has been shown to prevent this from happening, and it may even reduce the <a href="https://www.healthline.com/health/oxidative-stress" target="_blank">oxidative stress</a> that occurs during high intensity exercise. This isn't surprising when you consider that muscle is about 80% water.<a href="https://pubmed.ncbi.nlm.nih.gov/19344695" target="_blank"><span></span></a></p><p>If you exercise intensely and tend to sweat, staying hydrated can help you perform at your absolute best.</p><p><strong>Summary</strong></p><p><strong></strong>Losing as little as 2% of your body's water content can significantly impair your physical performance.</p>
2. Significantly Affects Energy Levels and Brain Function<p>Your brain is strongly influenced by your hydration status.</p><p>Studies show that even mild dehydration, such as the loss of 1–3% of body weight, can impair many aspects of brain function.</p><p>In a study in young women, researchers found that fluid loss of 1.4% after exercise impaired both mood and concentration. It also increased the frequency of headaches.</p><p>Many members of this same research team conducted a similar study in young men. They found that fluid loss of 1.6% was detrimental to working memory and increased feelings of anxiety and fatigue.<a href="https://www.cambridge.org/core/journals/british-journal-of-nutrition/article/mild-dehydration-impairs-cognitive-performance-and-mood-of-men/3388AB36B8DF73E844C9AD19271A75BF/core-reader" target="_blank"></a></p><p>A fluid loss of 1–3% equals about 1.5–4.5 pounds (0.5–2 kg) of body weight loss for a person weighing 150 pounds (68 kg). This can easily occur through normal daily activities, let alone during exercise or high heat.</p><p>Many other studies, with subjects ranging from <a href="https://www.healthline.com/health/parenting/signs-of-dehydration-in-toddlers" target="_blank">children</a> to <a href="https://www.healthline.com/health/symptoms-of-dehydration-in-elderly" target="_blank">older adults</a>, have shown that mild dehydration can impair mood, memory, and brain performance.</p><p><strong>Summary</strong></p><p><strong></strong>Mild dehydration (fluid loss of 1–3%) can impair energy levels, impair mood, and lead to major reductions in memory and brain performance.</p>
3. May Help Prevent and Treat Headaches<p>Dehydration can trigger <a href="https://www.healthline.com/health/dehydration-headache" target="_blank">headaches</a> and migraine in some individuals.<span></span></p><p>Research has shown that a headache is one of the most common symptoms of dehydration. For example, a study in 393 people found that 40% of the participants experienced a headache as a result of dehydration.</p><p>What's more, some studies have shown that drinking water can help relieve headaches in those who experience frequent headaches.</p><p>A study in 102 men found that drinking an additional 50.7 ounces (1.5 liters) of water per day resulted in significant improvements on the Migraine-Specific Quality of Life scale, a scoring system for <a href="https://www.healthline.com/health/migraine-symptoms" target="_blank">migraine symptoms</a>.<a href="https://academic.oup.com/fampra/article/29/4/370/492787" target="_blank"></a></p><p>Plus, 47% of the men who drank more water reported headache improvement, while only 25% of the men in the control group reported this effect.<a href="https://academic.oup.com/fampra/article/29/4/370/492787" target="_blank"></a></p><p>However, not all studies agree, and researchers have concluded that because of the lack of high quality studies, more research is needed to confirm how increasing hydration may help improve headache symptoms and decrease headache frequency.<a href="https://pubmed.ncbi.nlm.nih.gov/26200171" target="_blank"></a></p><p><strong>Summary</strong></p><p><strong></strong>Drinking water may help reduce headaches and headache symptoms. However, more high quality research is needed to confirm this potential benefit.</p>
4. May Help Relieve Constipation<p><a href="https://www.healthline.com/health/constipation" target="_blank">Constipation</a> is a common problem that's characterized by infrequent bowel movements and difficulty passing stool.</p><p>Increasing fluid intake is often recommended as a part of the treatment protocol, and there's some evidence to back this up.</p><p>Low water consumption appears to be a risk factor for constipation in both younger and older individuals.</p><p>Increasing hydration may help decrease constipation.</p><p><a href="https://www.healthline.com/nutrition/mineral-water-benefits" target="_blank">Mineral water</a> may be a particularly beneficial beverage for those with constipation.</p><p>Studies have shown that mineral water that's rich in magnesium and sodium improves bowel movement frequency and consistency in people with constipation.<a href="http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5334415" target="_blank"></a></p><p><strong>Summary</strong></p><p><strong></strong>Drinking plenty of water may help prevent and relieve constipation, especially in people who generally don't drink enough water.</p>
5. May Help Treat Kidney Stones<p>Urinary stones are painful clumps of mineral crystal that form in the urinary system.</p><p>The most common form is <a href="https://www.healthline.com/health/kidney-stones" target="_blank">kidney stones</a>, which form in the kidneys.</p><p>There's limited evidence that water intake can help prevent recurrence in people who have previously gotten kidney stones.<a href="https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD004292.pub3/full" target="_blank"></a></p><p>Higher fluid intake increases the volume of urine passing through the kidneys. This dilutes the concentration of minerals, so they're less likely to crystallize and form clumps.</p><p>Water may also help prevent the initial formation of stones, but studies are required to confirm this.</p><p><strong>Summary</strong></p><p><strong></strong>Increased water intake appears to decrease the risk of kidney stone formation.</p>
6. Helps Prevent Hangovers<p>A hangover refers to the unpleasant symptoms experienced after drinking <a href="https://www.healthline.com/nutrition/alcohol-good-or-bad" target="_blank">alcohol</a>.</p><p>Alcohol is a diuretic, so it makes you lose more water than you take in. This can lead to dehydration.</p><p>Although dehydration isn't the main cause of hangovers, it can cause symptoms like thirst, fatigue, headache, and dry mouth.</p><p>Good ways <a href="https://www.healthline.com/nutrition/7-ways-to-prevent-a-hangover" target="_blank">to reduce hangovers</a> are to drink a glass of water between drinks and have at least one big glass of water before going to bed.</p><p><strong>Summary</strong></p><p><strong></strong>Hangovers are partly caused by dehydration, and drinking water can help reduce some of the main symptoms of hangovers.</p>
7. Can Aid Weight Loss<p>Drinking plenty of water can help you <a href="https://www.healthline.com/nutrition/how-to-lose-weight-as-fast-as-possible/" target="_blank">lose weight</a>.</p><p>This is because water can increase satiety and boost your metabolic rate.</p><p>Some evidence suggests that increasing water intake can promote weight loss by slightly increasing your metabolism, which can increase the number of calories you burn on a daily basis.</p><p>A 2013 study in 50 young women with overweight demonstrated that drinking an additional 16.9 ounces (500 mL) of water 3 times per day before meals for 8 weeks led to significant reductions in body weight and body fat compared with their pre-study measurements.</p><p>The timing is important too. Drinking water half an hour before meals is the most effective. It can make you feel more full so that you <a href="https://www.healthline.com/nutrition/35-ways-to-cut-calories" target="_blank">eat fewer calories</a>.</p><p>In one study, dieters who drank 16.9 ounces (0.5 liters) of water before meals lost 44% more weight over a period of 12 weeks than dieters who didn't drink water before meals.</p>
The Bottom Line<p>Even mild dehydration can affect you mentally and physically.</p><p>Make sure that you <a href="https://www.healthline.com/nutrition/how-much-water-should-you-drink-per-day" target="_blank">get enough water each day</a>, whether your personal goal is 64 ounces (1.9 liters) or a different amount. It's one of the best things you can do for your overall health.</p>
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The enduring pandemic will make conventional forms of travel difficult if not impossible this summer. As a result, many will consider virtual alternatives for their vacations, including one of the oldest forms of virtual reality – books.
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Since even moderate-intensity workouts offer a slew of benefits, walking is a good choice for people looking to stay healthy.
How to Rock Your Walk<p>Walking isn't just fun and healthy. It's accessible.</p><p>"Walking is cheap," says Dr. John Paul H. Rue, a sports medicine doctor at <a href="https://mdmercy.com/" target="_blank">Mercy Medical Center in Baltimore</a>. "You can do it anywhere at any time; [it] requires little to no special equipment and has many of the same cardio benefits as running or other more intense workouts."</p><p>Want to up your walking game? Try the tips below.</p>
Use Hand Weights<p>Cardio and strength training can go hand-in-hand when you add weights to your walk.</p><p>A <a href="https://journals.lww.com/acsm-msse/Fulltext/2019/03000/Associations_of_Resistance_Exercise_with.14.aspx" target="_blank">2019 study</a> found that weight training is good for your heart, and <a href="https://www.mayoclinicproceedings.org/article/S0025-6196(17)30167-2/abstract" target="_blank">research</a> shows it reduces the risk of developing a <a href="https://www.healthline.com/health/nutrition-metabolism-disorders" target="_blank">metabolic disorder</a> by 17 percent. People with metabolic disorders have a higher chance of being diagnosed with high cholesterol, high blood pressure, and diabetes.</p><p>Rue suggests not carrying weights for your entire walk.</p><p>"Hand weights can give you an added level of energy burning, but you have to be careful with these because carrying [them] over a long period of time or while walking could actually lead to some overuse injuries," he says.</p>
Make It a Circuit<p>As another option, consider doing a circuit. First, put a pair of dumbbells on your lawn or somewhere in your home. Walk around the block once, then stop and do some bicep curls and tricep lifts before walking around the block again.</p><p>Rue recommends <a href="https://www.healthline.com/health/exercise-fitness/running-with-weights" target="_blank">avoiding ankle weights</a> during cardio workouts, as they force you to use your quadriceps rather than hamstrings. They can also cause muscle imbalance, according to the <a href="https://www.health.harvard.edu/staying-healthy/wearable-weights-how-they-can-help-or-hurt" target="_blank">Harvard Health Letter</a>.</p>
Find a Fitness Trail<p>Strength training isn't limited to weights. You can get stronger by <a href="https://www.healthline.com/health/bodyweight-workout" target="_blank">simply using your body</a>.</p><p>Often found at parks, fitness trails are obstacle courses with equipment for pullups, pushups, rowing, and stretches to build upper and lower body strength.</p><p>Try searching "fitness trails near me" online, checking out your local parks and recreation website, or calling the municipal office to <a href="https://calisthenics-parks.com/" target="_blank">find one</a>.</p>
Recruit a Friend<p>People who workout together stay healthy together.</p><p><a href="https://bmcgeriatr.biomedcentral.com/articles/10.1186/s12877-017-0584-3" target="_blank">One study</a> showed that older adults who exercised with a group improved or maintained their functional health and enjoyed their lives more.</p><p>Enlist the help of a walking buddy with a regimen you aspire to have. If you don't know anyone in your area, apps like <a href="https://www.strava.com/" target="_blank">Strava</a> have social networking features so you can get support from fellow exercisers.</p>
Try Meditation<p>According to the <a href="https://www.nccih.nih.gov/research/statistics/nhis/2017" target="_blank">2017 National Health Interview Survey</a>, published by the National Institutes of Health, meditation is on the rise, and for good reason.</p><p>Researchers <a href="https://pubmed.ncbi.nlm.nih.gov/29616846/" target="_blank">found</a> that mind-body relaxation practices can regulate inflammation, <a href="https://www.healthline.com/health/biological-rhythms" target="_blank">circadian rhythms</a>, and <a href="https://www.healthline.com/health/glucose" target="_blank">glucose</a> metabolism, as well as lower <a href="https://www.healthline.com/health/high-blood-pressure-hypertension" target="_blank">blood pressure</a>.</p><p>"Any form of exercise can be turned into a meditation of some type, either by the surroundings you are walking in, like a park or trail, or by blocking out the outside world with music on your headphones," Rue says.</p><p>You can also play a podcast or download an app like <a href="https://www.headspace.com/headspace-meditation-app" target="_blank">Headspace</a> that has a library of guided meditations to practice while you walk.</p>
Do Fartlek Walks<p>Typically used in running, fartlek intervals alternate periods of increased and decreased speed. These are <a href="https://www.healthline.com/nutrition/benefits-of-hiit" target="_blank">high-intensity interval training (HIIT)</a> workouts, which allow exercisers to accomplish more in less time.</p><p><a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0154075" target="_blank">One study</a> showed that 10-minute interval training improved <a href="https://www.healthline.com/health/metabolic-syndrome" target="_blank">cardiometabolic</a> health, or lowered the risk of heart disease, stroke, and diabetes, just as well as working out at a continuous pace for 50 minutes.</p><p><a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0111489" target="_blank">Research</a> also shows that HIIT workouts increase muscle <a href="https://www.healthline.com/health/fast-twitch-muscles" target="_blank">oxidative</a> capacity, or the ability to use oxygen. To do a fartlek walk, try walking at an increased pace for 3 minutes, slow down for 2 minutes, and repeat.</p>
Gradually Increase Pace<p>A faster walking pace is associated with a lower risk of <a href="https://www.healthline.com/health/copd" target="_blank">chronic obstructive pulmonary disease (COPD)</a> and respiratory diseases, according to a <a href="https://pubmed.ncbi.nlm.nih.gov/30303933/" target="_blank">2019 study</a>.</p><p>Still, it's best not to go from a stroll to an Olympic-worthy power walk in a day. Instead, increase your pace gradually to prevent injury.</p><p>"Start by walking at a brisk pace for about 10 minutes per day, 3 to 5 days per week," Rue says. "Once you've done this for a few weeks, increase your time by 5 to 10 minutes per day until you get to 30 minutes."</p>
Add Stairs<p>You've likely heard that taking the stairs instead of an elevator is a way to add more movement into your daily routine. It's also a way to step up your walking. Stair climbing has been shown to <a href="https://www.sciencedirect.com/science/article/pii/S2211335519301123?via%3Dihub" target="_blank">decrease the risk of mortality</a> and can easily add a bit more challenge to your walk.</p><p>If you don't have stairs in your home, you can often find them outside a local municipal building, train station, or at a high school stadium.</p>
Is Your Walk a True Cardio Workout?<p>Not all walks are equal. A walk that's too leisurely may not provide enough burn to qualify as cardio. To see if you're getting a good workout, try to <a href="https://www.healthline.com/health/how-to-check-heart-rate" target="_blank">measure your heart rate</a> using a monitor.</p><p>"A target goal for a good walking workout heart rate is about 50 to 70 percent of your maximum heart rate," Rue says, adding that maximum heart rate is <a href="https://www.healthline.com/health/fitness-exercise/fat-burning-heart-rate" target="_blank">typically calculated</a> by 220 beats per minute minus your age.</p><p>You can also monitor how easily you can carry on a conversation while you walk to gauge your heart rate.</p><p>"If you can walk and carry on a normal conversation, that's probably a lower intensity walk," says Rue. "If you are slightly breathless but can still have a conversation, that's probably a moderate workout. If you are out of breath and can't talk normally, that's a vigorous workout."</p>
Takeaway<p>By shaking up your routine, you can add excitement to your workout and reap even more rewards than a basic walk provides. Increasing the pace and intensity of a workout will make it more effective.</p><p>Simply pick your favorite variation to add some spice to your next walk.</p>
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