What Will Happen When Climate Change Becomes Irreversible

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What Will Happen When Climate Change Becomes Irreversible – A resident watches as fires blaze on the Greek island of Evia as it endures the worst heat wave in decades that experts have linked to the climate crisis. Photo: Angelos Tzortzinis/AFP/Getty Images

Climate scientists have warned that human activity is changing the Earth’s climate in “unprecedented” ways for thousands or hundreds of thousands of years, with some changes inevitable and “irreversible”.

What Will Happen When Climate Change Becomes Irreversible

What Will Happen When Climate Change Becomes Irreversible

A rise of more than 1.5C above pre-industrial levels over the next 20 years could disrupt the 2015 Paris climate agreement and lead to widespread destruction and extreme weather.

Climate Change Report: Humans Are Causing Widespread And Irreversible Impacts, Says Ipcc

According to a report by the Intergovernmental Panel on Climate Change, the world’s leading climate science body, rapid and substantial reductions in greenhouse gas emissions over the past decade alone could prevent climate disruption.

The Comprehensive Assessment of Climate Science released Monday, the IPCC’s sixth report since 1988, has been eight years in the making and has influenced the work of hundreds of experts and peer reviewers. It represents the world’s most complete knowledge of the physical basis of climate change to date, and found that human activities “consistently” cause climate change, including rising sea levels, melting Arctic ice caps and glaciers, heat waves, floods and droughts. . .

World leaders say the stark findings should compel new policy action as an urgent matter of the global economy’s transition to a low-carbon state. The governments of 197 countries will meet in Glasgow this November for the UN’s landmark climate talks, Cop26.

Floods in July caused extensive damage in Schuld, near Bad Neuenahr-Ahrweiler in western Germany, killing 189 people. Pictured: Christoph Stache/AFP/Getty Images

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Countries are required to reduce greenhouse gas emissions and limit global warming to no more than 1.5C above pre-industrial levels, reaching COP 26, the targets of the Paris Climate Agreement and the IPCC. It’s still possible, but just barely.

UN Secretary-General Antonio Guterres warned: “[The report] is a red code for humanity. Alarm bells aren’t ringing, and the facts are undeniable: Greenhouse gas emissions from fossil fuels and deforestation are suffocating our planet and putting billions of people at immediate risk. “

It called for an end to new coal plants, research and development of new fossil fuels, and a call for governments, investors and businesses to focus their energies on a low-carbon future. “This report should be the death of coal and fossil fuels before they destroy our planet,” he said.

What Will Happen When Climate Change Becomes Irreversible

UK Prime Minister Boris Johnson, host of Cop26, said: “Today’s report has been a great read and it is clear that the next decade will be critical to securing the future of our planet… I hope today’s report will be a useful tool for the important Cop26 summit in Glasgow in November. Moving the world before we meet. “

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US President Joe Biden’s special envoy, John Kerry, said: “The IPCC report shows the urgency of the moment. The world must come together before we limit global warming to 1.5C…Glasgow must be the turning point in this crisis. “

According to the IPCC, global temperatures rose by about 1.1C between 1850 and 1900, but a stabilization of 1.5C is still possible. Such warming would still lead to more heat waves, more severe storms and more severe droughts and floods, but would represent a smaller risk than 2C.

Richard Allan, professor of climate science at the University of Reading and lead author of the IPCC, says every part of the warming process is important. “You’re pushing extreme weather events into association with higher temperatures,” he said.

A firefighter and fire station in downtown Greenville, California on August 7. The wildfires destroyed an area larger than Los Angeles. Photo: Josh Edelson/AFP/Getty Images

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Civil society groups are calling on governments to take immediate action. “This is not the first generation of world leaders to be warned about the severity of the climate crisis, but it will be the last generation to ignore them,” said Doug Parr, chief scientist at Greenpeace UK. The frequency, scale and intensity of the climate disasters that have burned and flooded much of the world in recent months are the result of past inaction. Unless world leaders finally heed these warnings, the situation will only get worse.”

Stephen Cornelius, WWF’s climate change advisor, added: “It’s a stark assessment of the dire future we face if we don’t act. With the world at risk of irreversible damage, all aspects of warming are important to limit the risk. “

Even if we can limit global warming to 1.5C, the long-term effects of the warming already taking place are inevitable and irreversible. These include rising sea levels, melting arctic ice, and warming and acidifying oceans. According to IPCC scientists, drastically reducing emissions can prevent climate change but not return the world to a more temperate climate.

What Will Happen When Climate Change Becomes Irreversible

Ed Hawkins, professor of climate science at the University of Reading and lead author of the IPCC, said: “We are experiencing climate change, which will involve more and more extreme weather events, with nothing coming back for many of these impacts. “

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According to IPCC lead author Jory Rogelg, director of research at the Grantham Institute, Imperial College London, the report is likely to be the next IPC report. “This report shows how close we can get to 1.5C, the more ideal climate we live in, and shows we can get to 1.5C, but only if we reduce emissions over the next decade,” he said. . “If we don’t, 1.5C will go out the window until the next IPCC report at the end of this decade.”

Monday’s report will have two more parts next year: Part Two will address the impacts of the climate crisis and Part Three will detail possible solutions. Work on the report was delayed for several months by the Covid-19 pandemic, forcing scientists to work mostly online and via video conference. A UN report released this week raised the “irreversible” concern. Even if we stop emitting CO2 now, the long-term effects of climate change will last for centuries. The good news is that if we remove CO2 from the atmosphere, some of the effects are reversed. What does this mean for the future?

People walk through St. Mark’s Square in Venice on November 15, 2019, after the city experienced its worst flooding in 50 years. Rising sea levels lead to higher tides and flooding that could continue for hundreds of years even if we halt current climate change.

The latest UN report released this week has raised concerns about the “irreversible” effects of climate change even if we cut greenhouse gas emissions and halt global warming. .

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Tamsin Edwards, a climate scientist at King’s College London and co-author of the Intergovernmental Panel on Climate Change (IPCC), said: “We have already addressed some aspects of climate change, some of which will be irreversible for hundreds of thousands of years. . The report was released on Monday.

The good news is that some effects, like global warming, can be reversed, at least in theory, by removing carbon from the atmosphere.

UN warns of ‘irreversible’ climate change 2 years ago Continued 3:48 The Intergovernmental Panel on Climate Change says the world is at risk of ‘unanimous’ runaway and humans are to blame.

What Will Happen When Climate Change Becomes Irreversible

What makes some effects more irreversible than others? What does this mean for waste reduction and carbon footprint? What does this result mean for the future? Let’s take a closer look here.

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The report describes a series of changes that are already happening and would continue for centuries even if CO2 emissions were “stopped immediately”. These are:

Melting ice and glaciers could lead to water crisis 3 years ago Duration 2:51 New research has found that the world’s ice is disappearing at an alarming rate, and glaciers are showing huge amounts of ice. Canadian researchers say glacier retreat could have major implications for Canada’s water security.

Many instances of the Paris Agreement, which aims to keep temperatures below 1.5 degrees Celsius by 2100, are “exaggerated”.

Overshoot admits that global average temperatures will rise by more than 1.5 degrees Celsius because we don’t reduce emissions enough. Damon Mattis, a professor at Concordia University’s Institute for Climate Science and Sustainability, says that once we stop emitting CO2, it will stabilize above 1.5 degrees Celsius.

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