1. 1.5 Degrees Celsius Limit
Over the last 12 months, after years of taking the back seat, the idea of a 1.5C limit to global temperatures made steps into the limelight. The UN concluded its review of the 2C vs. 1.5C debate, suggesting that the lower limit would be “preferable.” A study found that the 1.5C target was still technically possible, though difficult. A guest post by Professor Myles Allen looks at the chances and the challenge ahead, while Carbon Brief also captured the views of a broad range of scientists.
The mounting pressure paid off, with the goal recognised in the final UN climate deal. So unexpected was its inclusion that climate scientists were “caught napping,” says Professor Piers Forster, in another guest post which surveys the task ahead of finding pathways towards the lower limit and the specific benefits of this long sought-after goal.
2. 188 Pledges
Over the course of the year, 188 countries submitted their “intended nationally determined contributions” or INDCs, to the UN. These pledges, which outline how nations plan to reduce emissions, form the backbone of the new UN climate deal. Carbon Brief has been tracking these promises of action and the money that they will cost to implement—a grand total of $3.5tn. We have also looked in-depth at the ambiguities and ambition of the major economies, including the EU, the U.S., Russia, Canada, China, Japan, Brazil, Indonesia, Australia and India.
Probably the most oft-repeated trope of 2015 was that these INDCs would not alone be enough to limit global temperature rise to below 2C. But according to a report from the UN Environment Program, the INDCs had political significance that can’t be expressed by mere numbers.
3. 331 Seats
After May’s shock UK general election victory for the Conservatives, winning a narrow majority with 331 seats, we asked experts what it would mean for climate and energy. Their cautious welcome now looks optimistic. Apart from a commitment to phase out coal, there has been little positive policy news and plenty of surprise negatives.
The Tories’ efforts to cut support for renewables, ostensibly so as to deal with a projected overspend in green subsidies, arguably go far beyond their manifesto commitments. After good progress on renewables, the outlook looks gloomy and there are doubts over meeting future UK carbon budgets. Departmental budgets have also been cut.
4. 184 Pages
The release of Pope Francis’ 184-page encyclical in June brought with it a heightened interest in the subject of climate change and not just among the world’s 1.2bn Catholics. The document, called "Laudato Si’" contained strong words from the Pontiff on issues including urbanization, the destruction of nature and carbon markets.
The encyclical was covered by media outlets around the world, although an Italian paper faced censure for leaking it early. Carbon Brief investigated the years of scientific consultations that went into the making of the document, including a scientific report from two Pontifical Academies that called for a zero-carbon world. The Vatican wasn’t the only religious institution to get involved in climate change this year. The Islamic Declaration on Climate Change, released soon after, called for a phase-out of fossil fuels.
5. <$50 a barrel
Oil prices have continued to surprise in 2015. After starting around $50 a barrel, prices rose slowly before plumbing new depths as the year end approaches. The International Energy Agency said fuel efficient vehicles and reduced oil subsidies were helping create a “new normal” of sluggish demand despite low prices.
Carbon Brief took an early look at what $50 oil might mean for the global energy mix, as well as climate and energy policy back in the UK, where cheaper gas has also played a part in coal use reaching historic lows.
6. 1,600,000,000 Tons
In Indonesia, 2015 will be remembered as the year that their forests went up in flame with even more ferocity than usual. Peat fires, resulting largely from illegal “slash and burn” clearance techniques, spread rapidly in dry conditions related to 2015’s strong El Niño and released 1.6bn tons of greenhouse gases. In just six weeks, this bumped Indonesia up from sixth to fourth place in terms of largest emitting countries, putting it ahead of Russia. Carbon Brief looked at the scale of the disaster.
7. ⅓ of Adults
More than a third of the world’s adults have never heard of climate change, according to new analysis of a global survey from 2007-08. In some developed countries, including Japan, U.S. and the UK, almost all adults have heard of climate change—although it turned out to be a different story when the pollsters asked them if it was a threat. Liberia, which came bottom of the list, had an awareness rate of just one fifth.
8. 1 in 6 Species
Climate change will accelerate the speed at which species become extinct, according to a review of scientific papers released in April. Scientists found that as many as 16 percent or one in six, of plants and animals would be under threat of dying out if global temperatures should rise by 4C. The risks increase exponentially as the planet warms. The study found that South American species have the highest extinction risk at 23 percent, followed by Australia and New Zealand’s at 14 percent.
9. 2 Times
Consumption of meat in Europe is twice as high as healthy levels and this is bad for the climate, according to a Chatham House study released in November. Global demand for meat is predicted to rise by 76 percent by the middle of the century, which could put upward pressure on greenhouse gas emissions. But it wasn’t all bad news, with the study’s authors suggesting that government action to nudge people towards sustainable diets would not be as politically toxic as is often assumed.
10. Zero Emissions
This year, the nations of the world collectively agreed to aim for zero or more precisely net-zero greenhouse gas emissions. The goal is firmly based in climate science, but its adoption was still unexpected.
Over the course of the year, the aim has been expressed in different ways. The G7 called for complete decarbonisation. The Vatican wanted zero carbon. COP21 briefly flirted with emissions neutrality. In the end though, the long-term goal of the final Paris climate deal is a “balance” between greenhouse gas emissions and sinks. That’s zero to you and me.
11. 1C of Warming
Scientists have said they expect 2015 to be the first year where the global annual average temperature surpasses 1C above pre-industrial levels. As the halfway point of the 2C limit embedded in international climate policy, this is a significant milestone for the planet. The World Meteorological Organization (WMO) says we’ve just had the hottest five-year period on record.
While this year’s El Niño was responsible for boosting 2015 temperatures higher than usual, scientists told Carbon Brief that it’s only a matter of time until temperatures rise beyond 1C more permanently. Indeed, the Met Office has already forecast that 2016 will surpass previous records to become the hottest ever year.
12. 0.6 Percent Fall in Emissions
After a decade of rapid increases, there’s now growing evidence that emissions have stalled worldwide, while UK emissions are falling through the floor. However, this is unlikely to signal a peak in global emissions just yet, the researchers caution.
The shift could mark a turning point for climate efforts, though even if the stalling of emissions is maintained, the world would remain a long way from its zero-emissions goal.
13. 9 Lowest Ice Extents
The nine lowest September ice extents in the Arctic have all occurred in the last nine years—a sign of the impact that climate change is having on the northernmost part of the planet. This summer, the Arctic saw its fourth lowest summer minimum on record, with ice shrinking to 4.41m square kilometers on the Sept. 11, according to the U.S.-based National Snow and Ice Data Center.
14. 341.4mm of Rain
Storm Desmond swept across the UK in early December, bringing a 24-hour record 341.4mm of rain in Cumbria, flooded homes and a renewed debate over the role of climate change in UK flooding. Carbon Brief wrapped up the media response and scientists’ views.
The year also brought record-breaking winds in the form of October’s 200mph Hurricane Patricia, though this caused less damage than March’s 190mph Hurricane Pam. Are these powerful storms linked to global warming? August’s 10-year anniversary of Hurricane Katrina offered a chance for Carbon Brief to reflect on the latest science.
15. 94 Points
To celebrate its fifth birthday and the launch of its new website, Carbon Brief held its inaugural quiz night in the basement of a central London pub. The winning team was DECC (Department for Energy and Climate Change) Science, which scored a grand total of 94 out of 125. We published the full quiz online, including questions set by the likes of Christiana Figueres and Amber Rudd, for those who feel like testing their brains.
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By Sara Lindberg
Whether you've hit a workout plateau or you're just ready to turn things up a notch, adding more strenuous exercise — also known as high-intensity exercise — to your overall fitness routine is one way to increase your calorie burn, improve your heart health, and boost your metabolism.
However, to do it safely and effectively, there are some guidelines you should follow. Keep reading to learn more about the benefits of vigorous exercise and how to safely dial up the intensity of your workouts.
What Is Considered Strenuous Exercise?<p>When it comes to exercise, the intensity of how hard you work out is just as important as the duration of your exercise session. In general, exercise intensity is divided into three categories:</p><ul><li>low</li><li>moderate</li><li>vigorous or strenuous</li></ul><p>For an activity to be vigorous, you need to work at 70 to 85 percent of your maximum heart rate, according to the<a href="https://www.heart.org/en/healthy-living/fitness/fitness-basics/target-heart-rates" target="_blank"> American Heart Association</a>. Examples of vigorous exercise include:</p><ul><li>running</li><li>cycling at 10 mph or faster</li><li>walking briskly uphill with a heavy backpack</li><li>jumping rope</li></ul><p>Low to moderate exercise is easier to sustain for longer periods since you work below 70 percent of your maximum heart rate and, sometimes, well below that level.</p><p>To reap health benefits, the <a href="https://www.hhs.gov/fitness/be-active/physical-activity-guidelines-for-americans/index.html" target="_blank">Physical Activity Guidelines for Americans</a> recommends that people age 18 and older get one of the following:</p><ul><li><strong>150 minutes</strong> of moderate-intensity aerobic activity per week</li><li><strong>75 minutes</strong> of vigorous aerobic activity per week</li><li><strong>combination of both types</strong> of activity spread throughout the week</li></ul>
Strenuous Exercise Vs. Moderate Exercise<p>Increasing your exercise intensity is fairly simple to do. You can still participate in your favorite activities — just at a more vigorous pace.</p><p>One of the benefits of more strenuous exercise is that you can reap the same rewards as moderate-intensity exercise but in less time. So, if time is of the essence, doing a more strenuous 20-minute workout can be just as beneficial as doing a slower 40-minute workout session.</p><p>Here are some examples of <a href="https://www.cdc.gov/nccdphp/dnpa/physical/pdf/pa_intensity_table_2_1.pdf" target="_blank">strenuous vs. moderate exercise<span></span></a>.</p><table><tbody><tr><th>Moderate intensity</th><th>Strenuous intensity</th></tr><tr><td>bicycling at less than 10 mph</td><td>bicycling at more than 10 mph</td></tr><tr><td>walking briskly</td><td>running, or hiking uphill at a steady pace</td></tr><tr><td>jog-walk intervals</td><td>water jogging/running</td></tr><tr><td>shooting baskets in basketball</td><td>playing a basketball game</td></tr><tr><td>playing doubles tennis</td><td>playing singles tennis</td></tr><tr><td>raking leaves or mowing the lawn</td><td>shoveling more than 10 lbs. per minute, digging ditches</td></tr><tr><td>walking stairs</td><td>running stairs</td></tr></tbody></table>
Benefits of Vigorous Exercise<p>Besides being more efficient, turning up the heat on your fitness sessions can benefit your health in a variety of ways. Let's take a closer look at some of the evidence-based benefits of a higher intensity workout.</p><ul><li><strong>Higher calorie burn.</strong> According to the <a href="https://www.acefitness.org/education-and-resources/professional/expert-articles/5008/7-things-to-know-about-excess-post-exercise-oxygen-consumption-epoc/?utm_source=Rakuten&utm_medium=10&ranMID=42334&ranEAID=TnL5HPStwNw&ranSiteID=TnL5HPStwNw-hYlKnAcfzfixAUsvnO6Ubw" target="_blank">American Council on Exercise</a>, working out at a higher intensity requires more oxygen, which burns more calories. It also contributes to excess post-exercise oxygen consumption (EPOC) or the "afterburn effect" that allows you to continue burning calories even after you finish working out. This means your metabolism will stay elevated for longer after a vigorous exercise session.</li><li><strong>More weight loss.</strong> A <a href="https://www.healthline.com/health-news/interval-workouts-will-help-you-lose-weight-more-quickly" target="_blank">higher calorie burn</a> and an elevated metabolism will help you lose weight more quickly than doing low- or moderate-intensity exercise.</li><li><strong>Improved heart health.</strong> According to a <a href="https://www.ncbi.nlm.nih.gov/pubmed/16377300" target="_blank">2012 study</a>, high- and moderate-intensity exercise appears to offer low chance of cardiovascular events, even in those with heart disease. Cardiovascular benefits may include improvements in:<ul><li><a href="https://www.healthline.com/health/diastole-vs-systole" target="_blank">diastolic blood pressure</a></li><li><a href="https://www.healthline.com/nutrition/15-ways-to-lower-blood-sugar#TOC_TITLE_HDR_1" target="_blank">blood sugar control</a></li><li>aerobic capacity</li></ul></li><li><strong>Improved mood.</strong> High-intensity exercise may also boost your mood. According to a large <a href="https://www.jstage.jst.go.jp/article/jpts/27/4/27_jpts-2014-736/_article" target="_blank">2015 study</a> that analyzed the data of more than 12,000 participants, researchers found a significant link between strenuous exercise and fewer depressive symptoms.</li><li><strong>Lower risk of mortality.</strong> According to a 2015 <a href="https://www.ncbi.nlm.nih.gov/pubmed/25844882" target="_blank">study</a>, researchers found that vigorous activity may be key to avoiding an early death. The study, which followed 204,542 people for more than 6 years, reported a 9 to 13 percent decrease in mortality for those who increased the intensity of their exercise sessions.</li></ul>
How to Measure Exercise Intensity<p>So, how do you know for sure that you're exercising at a strenuous level? Let's look at three ways to measure the intensity of your physical activity.</p><h3>1. Your heart rate</h3><p>Monitoring your heart rate is one of the most reliable methods for measuring exercise intensity. Exercising at 70 to 85 percent of your maximum heart rate qualifies as vigorous exercise intensity.</p><blockquote><strong><strong>WHAT IS YOUR MAXIMUM HEART RATE?</strong></strong>Your maximum heart rate is the fastest your heart can safely beat. To find out what your maximum heart rate is you need to subtract your age from 220. For example, for a 40-year-old person: <ul><li>220 bpm (beats per minute) minus age</li><li>220 – 40 = 180 bpm</li></ul>To work out at a vigorous pace, you'll want to exercise within 70 to 85 percent of your maximum heart rate. For example: <ul><li>180 x 0.70 (70 percent) = 126</li><li>180 x 0.85 (85 percent) = 153</li></ul>For a 40-year-old person, a vigorous training range is 126 to 153 bpm.<br></blockquote><p>You can check your heart rate while you're working out by wearing a heart rate monitor or <a href="https://www.healthline.com/health/how-to-check-heart-rate" target="_blank">taking your pulse</a>.</p>
How to Add Vigorous Activity to Your Workout<p>Adding strenuous activity to your weekly workout routine requires some careful planning. Fortunately, many of the activities that you do at a moderate level can easily be performed at a higher intensity.</p><p>One way of incorporating vigorous aerobic activity into your routine is to do a <a href="https://www.healthline.com/nutrition/benefits-of-hiit" target="_blank">high-intensity interval training (HIIT)</a> workout. This type of workout combines short bursts of intense activity — typically performed at 80 to 95 percent of your maximum heart rate — with recovery periods at 40 to 50 percent maximum heart rate.</p><p>To sustain this level of training, consider following a 2:1 work to rest ratio. For example, a <a href="https://www.healthline.com/health/treadmill-weight-loss#hiit" target="_blank">treadmill workout </a>or outdoor running session could include:</p><ul><li>running at 9 to 10 mph for 30 seconds</li><li>followed by walking at 3 to 4 mph for 60 seconds</li><li>alternating this work-to-rest ratio for 20 to 30 minutes</li></ul><p>Playing a fast-paced sport like soccer, basketball, or racquetball is another effective way to add strenuous activity to your fitness routine. Participating in <a href="https://www.healthline.com/health/benefits-of-a-spin-class" target="_blank">cycling classes</a> or swimming laps are other ways to build more strenuous exercise into your workouts.</p>
Safety Tips<p>Before you turn up the intensity on your workouts, it's important to keep the following safety tips in mind.</p><h3>Check with your doctor</h3><p>If you have a health condition or you haven't been active in a while, make sure you talk to your doctor before you start a high-intensity exercise routine. Your doctor can advise you on a safe level of exercise or how to become more active in the safest way possible.</p><h3>Build up the intensity slowly</h3><p>Going from low- or moderate-intensity workouts to vigorous exercise requires time and patience. While you may be ready to jump in with both feet, the safest way to add more vigorous exercise is to do it in bite-size increments. Pushing yourself too quickly can result in injuries and burnout.</p><p>For example:</p><ul><li><strong>Week 1:</strong> Swap out one moderate-paced cardio session for a HIIT workout.</li><li><strong>Week 2:</strong> Swap one moderate-paced session with a HIIT workout, and also add a circuit strength training session to your weekly routine.</li><li><strong>Week 3 and 4: </strong>Repeat weeks 1 and 2 before you start adding more high-intensity exercise to your weekly routine.</li></ul><p>It's also a good idea to space out your vigorous workouts throughout the week. Try not to do two strenuous sessions back-to-back.</p><h3>Don't forget the recovery time</h3><p>Your body requires more time to recover from a vigorous workout compared to a low- or moderate-intensity session.</p><p>To help your body recover, make sure to always include a cooldown and <a href="https://www.healthline.com/health/exercise-fitness/static-stretching" target="_blank">stretch routine</a> after strenuous physical activity.</p><h3>Stay hydrated</h3><p><a href="https://www.healthline.com/nutrition/7-health-benefits-of-water" target="_blank">Staying hydrated</a> is especially important when you're exercising hard. Not drinking enough fluids can affect the quality of your workout and make you feel tired, lethargic, or dizzy. It may even lead to <a href="https://www.healthline.com/health/dehydration-headache" target="_blank">headaches</a> and <a href="https://www.healthline.com/health/pain-relief/how-to-stop-leg-muscle-cramps" target="_blank">cramps</a>.</p>
The Bottom Line<p>Turning up the intensity of your workout sessions can be an effective way of boosting your overall health and fitness. It's also an easy way to save time when trying to fit a workout into your day.</p><p>To play it safe, always start slow and pay attention to how your body feels.</p><p>While vigorous exercise offers many health benefits, it's not appropriate for everyone. If you have a health condition or you haven't been active in a while, make sure to talk with your doctor before working out at a more strenuous level.</p>
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In January 2015, food sales at restaurants overtook those at grocery stores for the first time. Most thought this marked a permanent shift in the American meal.
Solving the Age-Old Problem of Spoiled Cheese<p>People have eaten pasta and cheese together for hundreds of years. Clifford Wright, the doyen of Mediterranean food history, says <a href="http://www.cliffordawright.com/caw/food/entries/display.php/topic_id/16/id/105/" target="_blank">the first written recipe</a> for macaroni and cheese was created in the court of the king of Naples in the 13th century, while <a href="https://food52.com/blog/9916-the-history-of-macaroni-and-cheese" target="_blank">the first reference</a> in an English language cookbook likely appeared in Elizabeth Raffald's 1769 book "The Experienced English Housekeeper."</p><p><span></span>An internet search for macaroni and cheese recipes will turn up over 5 million hits, but many still prefer to get theirs in a box – the kind with pasta that comes in shapes ranging from shells to Pokemon characters, accompanied by a packet of powdered cheese sauce.</p><p>Boxed macaroni and cheese was one outcome of the quest for ways to keep cheese longer. Some cheese gets better as it ages – a well-aged cheddar is one of life's delights – but once most cheeses hit their prime, <a href="https://www.dairyfoods.com/articles/91548-how-to-maximize-cheese-shelf-life" target="_blank">they tend to quickly go bad</a>. Before household refrigeration became common, many retailers wouldn't even stock cheese in the summer because it spoiled so quickly.</p><p>Processed cheese solved this age-old problem.</p>
When Natural Was Nasty<p>Today, food that's simple, pure and natural is <a href="https://theconversation.com/how-was-french-cuisine-toppled-as-the-king-of-fine-dining-66667" target="_blank">all the craze</a>, while <a href="https://apnews.com/c06a1200807c4b82a03452d08d480692" target="_blank">disdain for processed foods</a> is practically a credo among sophisticated consumers.</p><p>But when Kraft's different forms of processed cheese came out, they found widespread acceptance despite their strange textures. The fact that it wasn't natural didn't seem to bother consumers at all. In fact, as international food historian Rachel Laudan <a href="https://online.ucpress.edu/gastronomica/article/1/1/36/93394/A-Plea-for-Culinary-Modernism-Why-We-Should-Love" target="_blank">has noted</a>, back then, "natural was something quite nasty." She describes fresh milk as warm and "unmistakably a bodily secretion." Throughout the history of cookery, most recipes aimed to transform an unappetizing raw product into something delightful and delectable.</p><p>So for most consumers, processed foods were a godsend. They kept well, tended to be easily digestible and, most importantly, they tasted good. Many of them could be easily prepared, freeing women from spending entire days cooking and giving them more time to pursue professions and avocations.</p><p>In some ways, processed foods were also healthier. They could be fortified with vitamins and minerals, and, in an era before everyone had access to mechanical refrigeration, the fact that they kept well meant consumers were less likely to contract diseases from spoiled, rotten foods. Pasteurization of dairy products virtually <a href="https://www.the-scientist.com/foundations/rethinking-raw-milk--1918-65126" target="_blank">eliminated diseases like undulant fever</a>, while foods processed and canned in large factories were less likely to harbor food-borne illnesses that could crop up due to faulty or improperly sanitized equipment used by home canners.</p>
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By Mark Kaufman
Some fires won't die.
They survive underground during the winter and then reemerge the following spring, as documented in places like Alaska. They're called "overwintering," "holdover," or "zombie" fires, and they may have now awoken in the Arctic Circle — a fast-warming region that experienced unprecedented fires in 2019. The European Union's Copernicus Atmosphere Monitoring Service is now watching these fires, via satellite.