How Long Until Climate Change Is Irreversible

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How Long Until Climate Change Is Irreversible – ‘Code red for humanity’: UN doomsday report says global warming is already causing extreme weather and the world will warm by 1.5C by 2040 – a decade earlier than predicted

The Earth is expected to warm by 1.5 degrees Celsius over the next 20 years – faster than expected a decade ago – and heat waves, floods and droughts will become more frequent and severe, a bombshell UN report called ‘Code Red for It is called ‘Humanity’. . .

How Long Until Climate Change Is Irreversible

How Long Until Climate Change Is Irreversible

Scientists had expected temperatures to rise by 1.5C above pre-industrial levels between 2030 and 2052, but now believe it will happen between this year and 2040.

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The world’s largest climate change report also said it is not clear whether human influence has warmed the atmosphere, oceans and land.

Since 1970, global temperatures have risen faster than any other 50-year period in the last 2,000 years, the authors say, while the past five years have been the warmest on record since 1850.

“It’s just guaranteed to get worse,” said report co-author Linda Marnes, a senior climate scientist at the US National Center for Atmospheric Research. “I don’t see any area that’s safe…anywhere to run, nowhere to hide.”

Western Europe saw its worst flooding in decades last month, with more than 180 people dead after heavy rains hit Germany, Belgium, Luxembourg, Switzerland and the Netherlands.

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A heat wave killed hundreds of people on the west coast of the United States and Canada earlier this summer, while more than 300 people died and more than 13 million were affected by floods that hit China’s Henan province in late July. .

The 1.5C mark is considered the point where climate change becomes increasingly dangerous. The Paris Agreement on climate change in 2015 committed countries to limit warming to 1.5C, but they have already risen to 1.2C.

UN Secretary-General Antonio Guterres called the new report a “code red for humanity.” He warned: ‘The alarm bells are deafening and the evidence is overwhelming: greenhouse gas emissions from burning fossil fuels and deforestation are stressing our planet and putting billions of people at immediate risk.’

How Long Until Climate Change Is Irreversible

However, some experts say there is still hope that cuts in greenhouse gas emissions can stabilize rising temperatures.

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Scientists involved in the report say that 1.5 or 2 degrees Celsius of warming is not the threshold from which the world will sink, but every bit of warming makes a difference, so it is important to control it as much as possible. As the temperature rise is possible. .

Professor Richard Bates, from the Met Office Hadley Center and a contributing author to the report, said: “Like the speed limit on a motorway, going below it is not entirely safe and going over it will not immediately cause disaster. Yes, but there are definitely risks. . Increases if limit is exceeded.

If temperatures continue to rise, there could be catastrophic effects on Earth, including dramatic loss of marine life, an ice-free Arctic and more regular ‘extreme’ weather.

Climate change: UN report comes as record heat waves, fires and floods hit countries around the world. A firefighter is pictured above trying to put out a fire burning on the Greek island of Ayia over the weekend.

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These graphs show how human influence has warmed the climate at an unprecedented rate over at least the last 2,000 years.

UN scientists modeled changes in the world’s annual average temperature based on global warming of 1.5C, 2C and 4C.

With each additional increase in global warming the projected changes in extremes are greater in frequency and magnitude

How Long Until Climate Change Is Irreversible

– It is ‘unequivocal’ that human activities have warmed the atmosphere, oceans and land – with widespread and rapid changes around the world.

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– Many changes are unprecedented over several centuries to several millennia, with global warming at a rate unprecedented in at least 2,000 years.

– Atmospheric carbon dioxide levels are higher than they have been in three million years and methane levels are higher than they have been in 800,000 years, with increases in both greenhouse gases exceeding natural changes seen for hundreds of thousands of years.

– The average global temperature was about 1.1 degrees Celsius higher in the last decade than in the pre-industrial era, or the period 1850-1900, due to emissions from human activities such as burning fossil fuels and deforestation.

– Human-caused climate change is already affecting many weather and climate extremes in every region of the world, with strong evidence of more frequent or intense heat waves, heavy rains, droughts and tropical storms, and the role that humans play. The driver pays in change.

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– Humans are the main cause of global glacier retreat, sea ice loss, ocean warming and sea level rise. The rate of sea level rise is accelerating.

– Global temperatures will continue to rise until at least the middle of the century, and the world will reach or exceed 1.5 degrees Celsius of warming in the next 20 years.

– Global warming of 1.5 and 2 degrees Celsius – the limits to which countries have committed to avoid the dangerous effects of climate change – will increase in the 21st century unless there are significant reductions in emissions of carbon dioxide and other greenhouse gases in the coming decades. will not happen .

How Long Until Climate Change Is Irreversible

– Continued warming will increase the frequency and intensity of heat extremes, oceanic heat waves, heavy rains, droughts in some areas, the proportion of intense tropical storms and reductions in Arctic sea ice, ice cover and ice permanence.

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– Each additional increase in temperature leads to extreme changes, each additional 0.5°C increase in temperature leads to a marked increase in the intensity of heat waves, heavy rains that can lead to floods and droughts.

– Under future scenarios as carbon dioxide emissions increase, carbon sinks in the ocean and land, such as forests, are predicted to be less effective in slowing the accumulation of greenhouse gases in the atmosphere.

– Changes in oceans, sea levels and melting of permafrost and glaciers as a result of past and future warming are irreversible for decades, centuries or even millennia.

– Strong, rapid and sustained reductions in methane emissions will help prevent warming and improve air quality.

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Limiting warming to 1.5C clearly requires much more immediate emissions cuts than is happening now, but if the target is still being breached, we should not assume that all is lost and Leave – it will be able to follow the process to avoid reducing emissions. any longer. to warm up

Today’s report has been prepared by the United Nations Intergovernmental Panel on Climate Change (IPCC) by 200 scientists from 60 countries.

Drawing on more than 14,000 scientific papers, the review includes the latest information about past and potential future warming, how humans are changing the climate and how extreme weather events are increasing and sea levels are rising.

How Long Until Climate Change Is Irreversible

The authors say it is “virtually certain” that heat waves “have become more frequent and more intense in most land areas”.

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They also said that sea level rise of up to 2 meters by the end of this century ‘cannot be ruled out’, while the Arctic is likely to be ‘virtually sea ice-free’ in September before 2050.

Guterres urged countries to urgently step up efforts and establish national plans to reduce emissions this decade ahead of the UN climate summit in Glasgow in November.

He called for an end to coal-fired power plants and fossil fuel exploration, a shift to renewable energy and funding to protect vulnerable communities, and said spending on Covid-19 recovery must be consistent with climate goals. does

Prime Minister Boris Johnson hailed the report as “sober reading” and said it was clear the next decade would be crucial to securing the planet’s future.

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“We know what needs to be done to limit global warming – consigning coal to history and switching to clean energy sources, protecting nature and securing climate finance for countries on the frontline,” he added. .

Johnson, whose government will publish its strategy to reduce Britain’s emissions to net zero by mid-century this autumn but faces concerns about how to pay in a fair way, said: Britain is leading the way, our The economy is decarbonising faster than any other country. In the G20 over the past two decades.

“I hope today’s IPCC report will be a wake-up call to the world, to take action now, before we meet for the critical Cop26 summit in Glasgow in November.”

How Long Until Climate Change Is Irreversible

It comes as the government faces growing pressure from Tory supporters to ban fossil fuel cars and boilers.

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According to a report in The Times, Chancellor Rishi Sunak is drawing up plans for wealthy households to shoulder the burden of funding Britain’s climate change targets to protect low-income households.

Moves to decarbonise the economy include replacing boilers with gas and switching to electric or hydrogen cars – both of which involve huge upfront costs.

Humanity’s detrimental impact on climate is a ‘statement of fact’, UN scientists have said, adding that it is unclear whether human influence has warmed the atmosphere, oceans and land.

The report states that humans are the main cause of global glacier retreat, sea ice loss, ocean warming and sea level rise.

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It is also known that human activity is already responsible for 1.1 C of global warming since then

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