One Billion People May Become Climate Refugees By 2050
By Maria Trimarchi and Sarah Gleim
If all the glaciers and ice caps on the planet melted, global sea level would rise by about 230 feet. That amount of water would flood nearly every coastal city around the world [source: U.S. Geological Survey]. Rising temperatures, melting arctic ice, drought, desertification and other catastrophic effects of climate change are not examples of future troubles — they are reality today. Climate change isn't just about the environment; its effects touch every part of our lives, from the stability of our governments and economies to our health and where we live.
Where would you go if, say, a flood devastated the city you live in? Millions of people around the world have been forced to answer this question. In 2017, 68.5 million people were displaced — more than at any point in human history, according to the Brookings Institute. More than one-third of those were uprooted by sudden weather events, including floods, forest fires and intense storms. A 2018 report from the World Bank, which focused on three regions — Sub-Saharan Africa, South Asia and Latin America — found that without tangible climate action, more than 143 million people in just these three areas will be forced to move to escape the impacts of climate change by 2050.
But more than 1 billion people worldwide will live in countries with insufficient infrastructure to withstand climate change by 2050. The Pacific Islands are expected to be affected especially hard. Sea level there is already rising at almost 0.5 inches per year. Eight islands have already been submerged and two more are close to vanishing. By the year 2100, experts fear 48 more islands in the Pacific will be completely underwater.
So what about the people who live there? What do we call these people who will be displaced? It's actually complicated. It's difficult to determine what category these migrants should fall under because no global definition exists. Why does that matter? Without a standard method of classification, there's no way to track how many people are affected or displaced by an environmental or climate event. So the most commonly used term is "environmental refugee."
Experts credit the term and its definition to UN Environment Program (UNEP) researcher Essam El-Hinnawi, who in 1985 wrote the United Nations report titled "Environmental Refugees." El-Hinnawi defined environmental refugees as:
... those people who have been forced to leave their traditional habitat, temporarily or permanently, because of a marked environmental disruption (natural and/or triggered by people) that jeopardized their existence and/or seriously affected the quality of their life.
This working definition has been the baseline for current debate.
But according to the 1951 Geneva Refugee Convention, a refugee "is someone who is unable or unwilling to return to their country of origin owing to a well-founded fear of being persecuted for reasons of race, religion, nationality, membership of a particular social group, or political opinion" [source: United Nations High Commissioner for Refugees]. Environmental refugees do not legally fall under this status.
Why environmental refugees flee their homes is a complicated mixture of environmental degradation and desperate socioeconomic conditions. People leave their homes when their livelihoods and safety are jeopardized. What effects of climate change put them in jeopardy? Climate change triggers, among other problems, desertification and drought, deforestation, land degradation, rising sea levels, floods, more frequent and more extreme storms, earthquakes, volcanoes, food insecurity and famine.
The September 2020 Ecological Threat Register Report, by the Institute for Economics & Peace, predicts the hardest hit populations will be:
- Sub-Saharan Africa, South Asia, the Middle East and North Africa
- Afghanistan, Syria, Iraq, Chad, India and Pakistan (which are among the world's least peaceful countries)
- Pakistan, Ethiopia and Iran are most at risk for mass displacements
- Haiti faces the highest risk of all countries in Central America and the Caribbean
- India and China will be among countries experiencing high or extreme water stress
The report also suggests that developed countries like the United States and regions like Europe are not immune. "The European refugee crisis in the wake of wars in Syria and Iraq in 2015 saw 2 million people flee to Europe and highlights the link between rapid population shifts with political turbulence and social unrest." Developed countries including Sweden, Norway, Ireland face little to no threat, the report found.
Climate change does not impact all people and all parts of the world in the same way. While floods ravage some areas, deserts are spreading in others. Desertification and depleted resources, including shortages of water and fertile land, are long-term consequences of climate change. But one of the biggest threats will be food insecurity.
"Ecological threats and climate change pose serious challenges to global peacefulness," Steve Killelea, founder and executive chairman of the Institute for Economics and Peace said in the in the 2020 Ecological Threat Report. "Over the next 30 years, lack of access to food and water will only increase without urgent global cooperation. In the absence of action civil unrest, riots and conflict will most likely increase. COVID-19 is already exposing gaps in the global food chain."
The report suggests global demand for food will increase by 50 percent by 2050. That means if there's no increase in food supply, many people could starve or be forced to flee in search of food. Currently, more than 2 billion people around the world are already food insecure.
When faced with the decision to flee, most people want to stay in their own country or region. Leaving a country requires money and could mean leaving behind family; simply relocating from a rural to urban area in search of work and resources may be easier. Plus, the chance to return and resettle back home is unlikely if a family leaves their country entirely. In instances when an area is temporarily inhabitable, like after a destructive hurricane, returning home may be an option. But when coastlines — or entire islands — are underwater, the possibility of going home is out of the question.
The future impacts of climate change will disproportionately affect the world's poorest but will also pressure countries around the globe through mass migration of refugees. Adaptation and resilience will be the key to reducing displacement risk — both temporary and permanent — in the forms of early warning systems and flood-defense infrastructure, sustainable agriculture and drought-resistant crops, as well as other protections.
This story originally appeared in HowStuffWorks and is republished here as part of Covering Climate Now, a global journalism collaboration strengthening coverage of the climate story.
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The ghoulishly named ogre-faced spider can "hear" with its legs and use that ability to catch insects flying behind it, the study published in Current Biology Thursday concluded.
"Spiders are sensitive to airborne sound," Cornell professor emeritus Dr. Charles Walcott, who was not involved with the study, told the Cornell Chronicle. "That's the big message really."
The net-casting, ogre-faced spider (Deinopis spinosa) has a unique hunting strategy, as study coauthor Cornell University postdoctoral researcher Jay Stafstrom explained in a video.
They hunt only at night using a special kind of web: an A-shaped frame made from non-sticky silk that supports a fuzzy rectangle that they hold with their front forelegs and use to trap prey.
They do this in two ways. In a maneuver called a "forward strike," they pounce down on prey moving beneath them on the ground. This is enabled by their large eyes — the biggest of any spider. These eyes give them 2,000 times the night vision that we have, Science explained.
But the spiders can also perform a move called the "backward strike," Stafstrom explained, in which they reach their legs behind them and catch insects flying through the air.
"So here comes a flying bug and somehow the spider gets information on the sound direction and its distance. The spiders time the 200-millisecond leap if the fly is within its capture zone – much like an over-the-shoulder catch. The spider gets its prey. They're accurate," coauthor Ronald Hoy, the D & D Joslovitz Merksamer Professor in the Department of Neurobiology and Behavior in the College of Arts and Sciences, told the Cornell Chronicle.
What the researchers wanted to understand was how the spiders could tell what was moving behind them when they have no ears.
It isn't a question of peripheral vision. In a 2016 study, the same team blindfolded the spiders and sent them out to hunt, Science explained. This prevented the spiders from making their forward strikes, but they were still able to catch prey using the backwards strike. The researchers thought the spiders were "hearing" their prey with the sensors on the tips of their legs. All spiders have these sensors, but scientists had previously thought they were only able to detect vibrations through surfaces, not sounds in the air.
To test how well the ogre-faced spiders could actually hear, the researchers conducted a two-part experiment.
First, they inserted electrodes into removed spider legs and into the brains of intact spiders. They put the spiders and the legs into a vibration-proof booth and played sounds from two meters (approximately 6.5 feet) away. The spiders and the legs responded to sounds from 100 hertz to 10,000 hertz.
Next, they played the five sounds that had triggered the biggest response to 25 spiders in the wild and 51 spiders in the lab. More than half the spiders did the "backward strike" move when they heard sounds that have a lower frequency similar to insect wing beats. When the higher frequency sounds were played, the spiders did not move. This suggests the higher frequencies may mimic the sounds of predators like birds.
University of Cincinnati spider behavioral ecologist George Uetz told Science that the results were a "surprise" that indicated science has much to learn about spiders as a whole. Because all spiders have these receptors on their legs, it is possible that all spiders can hear. This theory was first put forward by Walcott 60 years ago, but was dismissed at the time, according to the Cornell Chronicle. But studies of other spiders have turned up further evidence since. A 2016 study found that a kind of jumping spider can pick up sonic vibrations in the air.
"We don't know diddly about spiders," Uetz told Science. "They are much more complex than people ever thought they were."
Learning more provides scientists with an opportunity to study their sensory abilities in order to improve technology like bio-sensors, directional microphones and visual processing algorithms, Stafstrom told CNN.
"The point is any understudied, underappreciated group has fascinating lives, even a yucky spider, and we can learn something from it," he told CNN.
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