13/01/2022

(The Guardian) Hottest Ocean Temperatures In History Recorded Last Year

The Guardian - 

Ocean heating driven by human-caused climate crisis, scientists say, in sixth consecutive year record has been broken

An oil platform stands offshore as cargo shipping container ships wait in the Pacific Ocean to enter the port of Los Angeles.
An oil platform stands offshore as cargo shipping container ships wait in the Pacific Ocean to enter the port of Los Angeles. Photograph: Patrick T Fallon/AFP/Getty Images

The heating up of our oceans is being primarily driven by the human-caused climate crisis, scientists say, and represents a starkly simple indicator of global heating. While the atmosphere’s temperature is also trending sharply upwards, individual years are less likely to be record-breakers compared with the warming of the oceans.



A firefighter sprays water as a house burns in the Dixie fire in the Indian Falls area of Plumas County, California.
Last year saw a heat record for the top 2,000 meters of all oceans around the world, despite an ongoing La Niña event, a periodic climatic feature that cools waters in the Pacific. The 2021 record tops a stretch of modern record-keeping that goes back to 1955. The second hottest year for oceans was 2020, while the third hottest was 2019.

“The ocean heat content is relentlessly increasing, globally, and this is a primary indicator of human-induced climate change,” said Kevin Trenberth, a climate scientist at the National Center for Atmospheric Research in Colorado and co-author of the research, published in Advances in Atmospheric Sciences.

Oceans in 2021 were the hottest ever recorded
Five hottest years of global ocean temperature recorded since 1955, in zettajoules
Note: Average temperature of the top 2,000 meters of ocean water. Zettajoules are a unit of energy equal to 10 to the power of 21 joules. Guardian graphic. Source: Cheng, et al., “Another Record: Ocean Warming Continues through 2021 despite La Niña Conditions”, 2022. 


    Warmer ocean waters are helping supercharge storms, hurricanes and extreme rainfall, the paper states, which is escalating the risks of severe flooding. Heated ocean water expands and eats away at the vast Greenland and Antarctic ice sheets, which are collectively shedding around 1tn tons of ice a year, with both of these processes fueling sea level rise.

Oceans take up about a third of the carbon dioxide emitted by human activity, causing them to acidify. This degrades coral reefs, home to a quarter of the world’s marine life and the provider of food for more than 500m people, and can prove harmful to individual species of fish.

As the world warms from the burning of fossil fuels, deforestation and other activities, the oceans have taken the brunt of the extra heat. More than 90% of the heat generated over the past 50 years has been absorbed by the oceans, temporarily helping spare humanity, and other land-based species, from temperatures that would already be catastrophic.

The amount of heat soaked up by the oceans is enormous. Last year, the upper 2,000 meters of the ocean, where most of the warming occurs, absorbed 14 more zettajoules (a unit of electrical energy equal to one sextillion joules) than it did in 2020. This amount of extra energy is 145 times greater than the world’s entire electricity generation which, by comparison, is about half of a zettajoule.

Long-term ocean warming is strongest in the Atlantic and Southern oceans, the new research states, although the north Pacific has had a “dramatic” increase in heat since 1990 and the Mediterranean Sea posted a clear high temperature record last year.

The heating trend is so pronounced it’s clear to ascertain the fingerprint of human influence in just four years of records, according to John Abraham, another of the study’s co-authors. “Ocean heat content is one of the best indicators of climate change,” added Abraham, an expert in thermal sciences at University of St Thomas.

“Until we reach net zero emissions, that heating will continue, and we’ll continue to break ocean heat content records, as we did this year,” said Michael Mann, a climate scientist at Penn State University and another of the 23 researchers who worked on the paper.Better awareness and understanding of the oceans are a basis for the actions to combat climate change.”

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(INVERSE) 11 Vital Climate Lessons From 2021 To Help You Through 2022

INVERSETara Yarlagadda

This year will be pivotal.

Stocktrek/Photodisc/Getty Images

Forget what you thought you knew about the climate crisis.

In terms of weather, this year will be so much more extreme than the past — but it could also be the year we take the path to change.

Every major climate moment in 2021 reveals the potential for innovation, resilience, and actions that both individuals and governments can take to ride out the coming storms.

It is impossible to put a positive spin on the extreme weather events that marked 2021, and which will only become more frequent in the coming years due to global warming.

But as we get a New Year underway, it is worth examining 11 of the wildest climate takeaways of 2021 — and the helpful steps forward they reveal that can help us address the crisis head-on.

In brief, our shortlist comes down to these 11 lessons:

11. Trees’ growing seasons are changing

10. Far more fossil fuels need to stay underground than we thought

9. Climate change needs a messaging reboot

8. The permafrost is more critical to the future of Earth than you know

7. We now know when polar bears will disappear — unless we act

6. The fate of the Arctic and the western United States are connected

5. A maligned animal could help solve global warming

4. Cities need to change for one vital reason

3. The Amazon rainforest may not save us

2. Animals are evolving to cope

1. It’s not so simple as taking a year off from air travel

Let’s dive into each of these lessons...

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11. Trees’ growth seasons are changing — and making allergies worse

Climate change affects trees and plant life — and, in turn, our seasonal allergies. According to a February 2021 study, warming temperatures lengthen the spring pollen season, in turn worsening the symptoms of seasonal allergies and other respiratory issues.

A second study suggests warmer temperatures in cities, in particular, are causing trees’ leaves to turn green earlier in spring. The autumnal leaf color change occurs later, in contrast — again, likely exacerbating allergies.

Here’s the solution

Trees have been shown to cool cities down, and advocates have encouraged tree planting to offset carbon dioxide emissions contributing to global warming.

But these studies and other research suggest we need to be more conscientious about where, when, and how we go about planting trees in cities, taking into account how their growing season is affected by urban environments.

The best thing you can do to minimize pollen exposure is to avoid outdoor activities early in the morning — when pollen counts are highest — and to close your window at night.

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10. Fossil fuels need to stay in the ground


coal power station
A coal power station. Researchers say 90 percent of the world’s coal must remain in the ground if we are to meet necessary climate change targets. Getty


A coal power station. Researchers say 90 percent of the world’s coal must remain in the ground if we are to meet necessary climate change targets.Getty

To keep global temperatures from rising above 1.5 degrees Celsius above pre-industrial levels — the ideal benchmark to avert climate catastrophe — in a paper published earlier this year, a team of researchers says we have to keep the majority of the world’s fossil fuels in the ground. That includes 97 percent of the coal in the United States.

Specifically, the researchers state:
  • Sixty percent of the world’s oil and methane gas needs to remain unextracted
  • Ninety percent of the world’s coal needs to remain unextracted


Here’s the solution

We need to speed up the transition to renewable energy.

To that end, the researchers give five specific suggestions to make the transition toward renewable energy:
  1. Nix production subsidies for fossil fuels
  2. Tax the production of fossil fuels
  3. Penalize companies that fail to comply with fossil-fuel regulations, especially methane leaks
  4. Ban new fossil-fuel exploration
  5. Institute international initiatives, like a treaty on the non-proliferation of fossil fuels

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9. People care about climate change

Earlier this year, the United Nations released findings from the People’s Climate Vote, the world’s largest survey on climate change thus far. It encompasses 1.2 million participants from 50 countries.

You can read our full summary of the key findings, but the biggest takeaway of all is people of all ages recognize climate change is an emergency. Yet not everyone favored urgent action, suggesting a lack of education around climate change issues — there is also a clear generational difference in how people think about climate change. According to the findings:
"Nearly 70 [percent] of under-18s said that climate change is a global emergency, compared to 65 [percent] of those aged 18-35, 66 [percent] aged 36-59 and 58 [percent] of those aged over 60."

Here’s the solution

The report clearly states “more education is required even for those people who are already concerned about climate change.” Organizations like NASA are on it — the space agency currently offers climate change curriculum resources for U.S. schools.

The report also highlights four popular climate-change policies for governments to aim toward:
  1. Conservation of forests and land (54 percent)
  2. Solar, wind, and renewable power (53 percent)
  3. Climate-friendly farming techniques (52 percent)
  4. Investing more in green businesses and jobs (50 percent)
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8. The permafrost is an overlooked and critical factor in global warming

 
Permafrost thaw and flooded Siberian forest
Thawing of the permafrost is flooding forests in Siberia — and exacerbating global warming. Getty


Thawing Siberian permafrost — a layer of soil that normally remains frozen year-round — has unearthed the terrifying remains of ancient creatures, but an even scarier thing is emerging from beneath the ice.

In 2021, scientists concluded policymakers, including at the UN, aren’t focusing enough on the emissions released from the melting permafrost and Arctic wildfires. The researchers predict carbon dioxide emissions from permafrost may increase by 30 percent by the end of the century — a metric that isn’t being considered in climate change conversations.

As a result, policymakers may be seriously underestimating the amount of fossil fuel emissions we need to reduce to keep global warming in check.

Here’s the solution

Scientists need to warn policymakers of the imminent threat posed by permafrost thaw and Arctic wildfires, especially ahead of key climate talks.

The UN wrapped up its climate change conference, COP26, earlier this year, but will reconvene in Egypt next year for further discussions — the permafrost should be on the agenda.

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7. When polar bears will disappear

Polar bear on melting iceberg
It’s not too late to save the Arctic or the polar bears, but we have to act now to reduce greenhouse gas emissions. Getty 

Scientists have been sounding the alarm on the threat melting Arctic ice poses to polar bear habitats, but in 2021, they put an extinction date on this iconic species — if we should fail to act on climate change.

Under a scenario of high greenhouse gas emissions, Arctic summer ice will completely melt by 2100, killing off the ice-dependent polar bear as well.

Here’s the solution

If we can lower greenhouse gas emissions and global warming to below 2 degrees Celsius Celsius above pre-industrial levels, summer ice — and polar bears — in the Arctic will still have a fighting chance.

Countries can also establish protected marine reserves, like Canada’s Tuvaijuittuq Marine Protected Area, to reduce pollutants that harm sea ice.

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6. Ice melt fuels extreme weather

In 2021, wildfires raged out of control from California to Greece. Longer and drier fire seasons, fueled by climate-change-driven drought, were to blame. But scientists also recently identified a devastating link between wildfires and a surprising place: the Arctic.

Using scientific models, researchers demonstrated how melting Arctic sea ice could be linked to hotter and drier weather in the western U.S. through air circulation patterns. So, melting Arctic sea ice could indicate a greater risk of wildfires in this region.

Here’s the solution

Researchers are hopeful that their findings can inform better fire management in the western U.S. since they can track the loss of Arctic sea ice a few months in advance of fires in the U.S. and prevent wildfires from occurring in the first place.

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5. Cows may have a silver-lining

Cow closeup
Moo. Getty

Scientists have long recognized the devastating effect of cows’ belches and farts, which release methane into the atmosphere.

But what if we could harness cows to help save us from the climate crisis? It’s a radical idea, but two recent pieces of research suggest it’s not a completely farfetched idea.

Here’s the solution

The first study proposes potty training cows to urinate in specific areas, thereby limiting the flow of nitrous oxide from their pee. Nitrous oxide is a greenhouse gas that is 300 times more potent than carbon dioxide, so this bizarre experiment could have seriously positive results for the climate.

The second study tackles the problem of plastic recycling using cows, or, rather, their guts. Single-use plastic products clog our landfills, and their production contributes to global warming. Researchers found that bacterial enzymes in the cow’s rumen are very good at decomposing plastic.

Don’t worry — this doesn’t mean we’ll feed plastic to cows. Instead, researchers suggest acquiring cow rumen from slaughterhouses and using their bacterial enzymes to degrade plastic on a commercial scale.

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4. Record-breaking heat hits multiple cities

2021 may go down as the first hottest year of the rest of our lives. Heatwaves scorched much of the western US in June 2021, followed by record-breaking December temperatures.

Rising temperatures are one of the most keenly felt effects of the climate crisis this year — and cities are especially vulnerable due to the urban heat island effect, which traps heat in asphalt. Researchers revealed a map showing which cities — such as Dhaka, Shanghai, and Baton Rouge — are greatest at risk of deadly urban heat.

Here’s the solution


There are ways we can beat the heat. In parts of India, climate-resilient cities are getting ahead of heatwaves by painting white “cool roofs” that deflect sunlight.

The UN also released a list of six cities that are using climate-friendly cooling methods. Among them is Paris, France, which takes water from the Seine River, chills it, and runs it through pipes surrounding buildings for cooler temperatures — an eco-friendly A/C replacement.

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3. Deforestation is turning the Amazon rainforest into a carbon emitter

Deforestation in Amazon
Large swaths of the Amazon are being deforested for cattle grazing, contributing to global warming. Getty

Environmentalists often refer to the Amazon as “the world’s lungs.” Historically, it’s been one of the world’s largest carbon sinks — places that absorb more carbon dioxide than they emit, helping reduce the impact of global warming.

But due to rampant deforestation in the Amazon, the rainforest has turned from one of the world’s largest carbon sinks to one of its biggest emitters. Two shocking findings from earlier this year confirm this trend.

First, a study published in Nature found the rainforest is now emitting 0.3 billion tons of carbon into the air each year. Second, a study published in Proceedings of the National Academy of Sciences found deforestation and climate-change-related drought is significantly reducing the Amazon’s role as a carbon sink.

Here’s the solution

We need to halt deforestation in the Amazon — fast.

World leaders at the UN’s COP26 conference announced a landmark initiative to end deforestation by 2030, which will, presumably, focus heavily on the Amazon. Brazil, which controls much of the Amazon, also signed this pledge.

Meanwhile, consumers can consider if products they consume are resulting in deforestation in the Amazon. Trees in the Amazon are commonly cut down to make room for soy production and grazing for cattle, AKA, beef.

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2. Animals are adapting to climate change

Frog jumping
Ribbit, ribbit. Climate change is here. Getty

Frogs are aging rapidly due to climate change. Animals like rabbits are evolving longer ears to cope with hotter temperatures.

Some birds in the Amazon are becoming smaller to cope with drier conditions. Other birds, who could theoretically help save plants from the climate crisis by transporting their seeds to cooler northern climates, are counterintuitively flying south to hotter environments instead.

 In short: animals are transforming and migrating in a number of ways due to climate change — and not all of them are good.

Here’s the solution

With more animals on the move to escape warmer environments during climate change, some scientists are saying we need to reconsider how we consider so-called “invasive” species that are not native to a region.

To be clear: Invasive species are no joke, and can significantly reshape ecosystems around the world, even in remote places like Antarctica.

But as climate change forces animals to move north, some ecologists are suggesting these animals are not invasive species, but, rather, climate refugees. Other scientists suggest invasive species can be reduced or managed, but don’t need to be eliminated entirely.

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1. Greenhouse gas emissions are up — but there is a silver lining

Fossil fuel emissions from a factory
Fossil fuel emissions spiked once again in 2021, but emissions may have overall flattened over the past decade. Shifts in electric vehicles and transportation could help reduce greenhouse gas emissions in the near future. Getty

Despite greenhouse gas emissions briefly plummeting in spring 2020 due to worldwide lockdowns, by early 2021, NASA’s early 2021 climate data shows that global warming continued unabated, making the past decade the hottest one on record.

As lockdowns ended and global consumption returned, experts predicted that humans will emit 36.4 gigatons of carbon dioxide in 2021. According to the Global Carbon Project, carbon dioxide levels rebounded by 4.9 percent in 2021, with India and China seeing particularly large spikes in coal.

On a slightly positive note: Emissions from the oil industry are lower in 2021 than 2019, and the researchers suggest that overall carbon dioxide emissions may have flattened over the past decade, though these results are still preliminary.

Here’s the solution


The message from climate scientists is loud and clear: We need to shift away from fossil fuels as quickly as possible to save our planet from catastrophe.

On the political level, leaders recently came together at the UN COP26 climate conference to agree to several landmark agreements on reducing fossil fuels, from creating a “Beyond Oil & Gas Alliance” to a global pledge to reduce methane — a significant contributor to carbon emissions.

On a corporate and individual level, some of the most promising efforts to cut fossil fuel emissions are coming in the field of transportation, which accounted for 29 percent of 2019 greenhouse gas emissions in the U.S.

Numerous reports suggest electric vehicles are nearing a “tipping point” to make them more affordable for the masses. As e-bike sales grew 145 percent during 2020 and 2021, that e-cycling trend will also go a long way in taking fossil fuel-guzzling cars off the road. 

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(Scientific American) Fires Doubled Australia’s Carbon Emissions—Ecosystems May Never Soak It Back Up

Scientific American - Chelsea Harvey, E&E News

Increasing odds of hot, dry weather make it less likely trees and other plants will quickly grow back

A woman watches over her horses as fire approaches. Bumbalong Road, Bredbo North in February 2020 near Canberra, Australia. Credit: Brook Mitchell/Getty Images

Bush fire season is underway again in Australia, where summer has just kicked off. Yet the country is still recovering from record-breaking wildfires two years ago that killed at least 33 people, destroyed thousands of homes and burned more than 65,000 square miles of land.

How quickly the natural landscape recovers depends on the climate over the coming years. It might take a couple of decades under average conditions. But if the weather stays hot and dry—and if more extreme wildfires occur in the meantime—the ecosystem might never get back to normal.

That’s the takeaway from a study published last month in AGU Advances that examined the impact of the record-breaking blazes on the Australian carbon cycle.

These fires likely released somewhere around 186 million tons of carbon into the atmosphere, the research found. It’s a staggering amount—more than the entire country emits in a typical year by burning fossil fuels.

Ordinarily, it would probably take the landscape about 20 years to soak all that carbon back up again, as trees and other plants gradually begin to grow back. But climate change presents a problem: The weather in Australia is getting hotter, and the risk of drought is growing stronger.

That could slow things down—potentially indefinitely.

“It’s getting warmer and drier, so it can take longer to recover from fires—plus, you’re having more fires,” said Brendan Byrne, a postdoctoral researcher at NASA’s Jet Propulsion Laboratory and the lead author of the new study. “That’s a concern that we’re causing permanent carbon losses in these areas.

”Under typical conditions, Australia’s forests and grasslands act as a carbon sink—they soak up carbon dioxide from the atmosphere and store it away. That makes them a valuable climate resource. When these landscapes are stressed or damaged, on the other hand, they can release carbon back into the air.

Byrne and the other researchers, from institutions in the United States, Australia and New Zealand, examined the impact of both drought and wildfires on the Australian ecosystem during the 2019-20 bush fire season. They conducted the study using satellite observations, which monitor carbon dioxide and other greenhouse gas concentrations in the atmosphere.

The study found that the bush fires more than doubled Australia’s annual carbon footprint.

In a typical year, Australia emits around 104 million metric tons of carbon through the burning of fossil fuels. The fires in 2019 and 2020, plus the added effects of drought, added an extra 186 million tons on top of it.

That’s in line with estimates from other research.

Since the record-breaking season, several other studies have attempted to quantify the amount of carbon the bush fires produced. Some of them used different methods—they looked at the total amount of land burned by the blazes and then estimated the emissions based on that burned area. Yet they came to similar conclusions.

The fact that these bottom-up estimates largely agree with the top-down estimates produced by satellite observations means that scientists now have “quite a bit of confidence in what these emissions actually were,” according to Byrne.

Byrne and his colleagues also looked at how the Australian landscape recovers under different conditions.

When forested areas are struck by drought, they tend to lose some carbon. But when the weather grows cooler and wetter again, they tend to bounce back quickly. Areas that have been burned by wildfires, on the other hand, recover from drought much more slowly.

That means both drought and fire can compromise the land’s ability to soak up carbon from the atmosphere. And global warming is increasing the odds of both.

Based on their observations, the researchers estimate that it should take about 21 years for the Australian ecosystem to soak up all the carbon it lost in the 2019-20 bush fires. That’s under average conditions. In a cooler, wetter climate, it could be done in a decade or so.

On the other hand, if the climate grows hotter and drier, some of that carbon might never be regained. That’s especially likely if more wildfires keep interrupting the recovery process.

The study highlights several growing concerns among scientists about climate change and natural ecosystems. As certain parts of the Earth heat up, dry out and burn more easily, they may emit more and more carbon into the atmosphere. That could speed up the rate of global warming even further.

Satellite studies are one way to keep an eye on these kinds of events, Byrne noted.

At the same time, as the Earth continues to warm, some landscapes may be dramatically—and irreversibly—altered.

“This is something people are really worried about—you end up in some kind of transition to a different type of ecosystem,” Byrne said. “That’s the kind of real concern in this area.”

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