A new UN climate report Released on Monday morning It clearly stated how climate change has caused severe damage to the world, warning that any additional warming would only contribute to more extreme disasters.
“There is no doubt that human influence has warmed the atmosphere, oceans and land,” according to a summary of the results of the report refined for decision makers. “Human-induced climate change has affected many weather and climate extremes in every region of the world.”
The highly anticipated report is The sixth climate assessment Released by the United Nations Intergovernmental Panel on Climate Change, it provides the most comprehensive scientific overview of the impact of the climate crisis so far and analyzes the extent to which it may still deteriorate.
The latest report is different from the previous version in that it clearly pointed out the cause of the climate crisis: man-made climate pollution. The report warns that if humans do not control the emissions of carbon dioxide, methane and other greenhouse gases, fatal heat waves, rainstorms, droughts and other disasters will become more intense and frequent.
Hundreds of scientists around the world contributed to the report and its main findings, which are detailed in the summary for policymakers. Other reports will be released within the next one and a half years: the second report will delve into who is most vulnerable to continuing climate impacts and how to best prepare for these effects, while the third report will focus on how to prevent further impacts. warming.
Ko Barrett, vice chairman of the IPCC and senior climate advisor for the US National Oceanic and Atmospheric Administration, said at a press conference on Sunday that the statement that human activities should ultimately be attributed to human activities is “the strongest statement ever made by the IPCC.”
The findings of the new report may increase the pressure on world leaders who will meet in Glasgow in November as part of their continued participation in the Paris climate agreement.
According to the report, if countries around the world unite to reduce greenhouse gas emissions to net zero emissions by 2050-the set goal of the Paris climate agreement-rising global temperatures and other climate impacts may be slowed or even reversed.
Taking positive action now can ensure that “the warming of the next two decades may be our last ten years,” said another report co-author, Georgia Institute of Technology climate professor Jin Cobb, in a press conference. “This is really important to me, remember it here.”
Summer is a series of disasters.A sort of Record-breaking heat wave Killed hundreds of people In the Pacific Northwest and Canada. Flooding in Germany More than 100 people were killed and hundreds were missing.Thousands of people displaced Flooding in China. at the same time, Persistent wildfire Are raging around the world, from California arrive Greece arrive Siberia.
The frequency and intensity of disasters are increasing. This is just one of the ways in which the earth changes due to climate change in the IPCC report:
Global surface temperature Since the industrial age, it has risen by approximately 1.1 degrees Celsius so far. This man-made warming rate is unprecedented in at least 2000 years.
Heat wave And precipitation events have become more frequent and intense around the world.
drought It is also intensifying.
The upper layers of the ocean are also warming, ocean acidification is increasing, and Arctic sea ice is decreasing.
Since the 1980s, the frequency of ocean heat waves has roughly doubled.
Global Sea level has risen About half a foot, the rate of sea level rise is increasing as a result of melting glaciers and thermal expansion of seawater. The sea level rise observed since 1900 is the fastest in at least 3000 years.
And at the same time The shrinking of so many glaciers At least in the last 2,000 years of the earth’s history, it was unprecedented on a global scale.
If mankind does not stop emitting greenhouse gases into the atmosphere, the situation will be even worse.
“With each increase in global warming, the changes in extreme events continue to become greater,” according to the summary report. In a world without man-made climate change, extreme high temperature events, such as heat waves, which occur on average once every 10 years, may now occur approximately 2.8 times every 10 years.
If the earth continues to warm up, like this Fatal event Will become more likely. According to the report, as the temperature rises by 1.5 degrees Celsius, extreme heat waves and other events may occur 4.1 times every ten years, and a 2 degree increase in temperature may increase the frequency to 5.6. The most worrying situation is that the temperature rises by 4 degrees, and fatal high temperature events occur approximately every year.
It’s not just extreme heat. The IPCC report warns that for every 0.5 degree Celsius increase in temperature, the frequency and intensity of heavy rain events and agricultural and ecological droughts will increase. More warming also brings more opportunities for concurrent disasters, such as the simultaneous occurrence of heat waves and droughts.
But although the situation may get worse, the report emphasizes that taking swift and positive action on climate change can even reverse some of its effects. Quick efforts not only stop the emission of greenhouse gases, but also discharge them from the air to achieve negative emissions, which will stimulate the reversal of surface temperature and surface ocean acidification.
Unfortunately, not all climate influences can be stopped. For example, some global sea level rise is now inevitable. “By the middle of this century, around 2050, sea level changes have been largely locked in,” said Bob Cope, the co-author of the summary report. “No matter how fast we reduce emissions, we may see global sea levels rise by about 15 to 30 cm, or about 6 to 12 inches.”
In addition, he added, “Sea level forecasts are becoming more and more sensitive to the emission choices we make today.” With a temperature increase of 2 degrees, the sea level will rise by about 1.5 feet by 2100; at 4 The water level may rise more than 2 feet in this century.
“It is possible to prevent many terrible effects, but it does require unprecedented transformational change,” Barrett said. “I think the idea that there is still a way forward should give us some hope.”