Major climate change is inevitable and irreversible

Climate scientists warn that human activities are changing the Earth’s climate in ways unprecedented in thousands or hundreds of thousands of years, and some of these changes are now inevitable and irreversible.

In the next 20 years, temperatures may rise by more than 1.5 degrees Celsius from pre-industrial levels, defying the ambitions of the 2015 Paris climate agreement, and bringing widespread destruction and extreme weather.
According to the world's leading climate authority, the Intergovernmental Panel on Climate Change, only a rapid and substantial reduction in greenhouse gases during this decade can prevent this climate collapse, and every further increase in temperature may increase and accelerate the impact on science.
The Climate Science Comprehensive Assessment released on Monday is the sixth report of its kind by the IPCC since 1988. It lasted eight years and brought together the work of hundreds of experts and peer-reviewed research. It represents all the world's knowledge of the physical basis of climate change so far, and it has been found that human activities are "clearly" the cause of rapid climate change, including sea level rise, melting of polar ice and glaciers, heat waves, floods and droughts.
World leaders said that the harsh survey results must be taken as a matter of urgency to force new policy measures to shift the global economy to a low-carbon basis. Governments from 197 countries will hold an important UN climate negotiation in Glasgow in November this year, called Cop26.
Every country is required to come to Cop26 with a new plan to reduce greenhouse gas emissions to a level and limit global warming to a pre-industrial level not exceeding 1.5C. The ambitions of the Paris climate agreement and the goals emphasized by the IPCC are It is still possible, but nothing more.
United Nations Secretary-General Antonio Guterres warned: "[This report] is the red code for mankind. The alarm bells are deafening, and the evidence is irrefutable: the greenhouse gas emissions from fossil fuel burning and deforestation are killing our planet. , And put billions of people at direct risk.
He called for an end to new coal-fired power plants and new fossil fuel exploration and development, and called on governments, investors and companies to devote all their efforts to a low-carbon future. "This report must sound the death knell for coal and fossil fuels, lest they destroy our planet," he said.
The IPCC stated that since 1850 to 1900, the temperature has now risen by approximately 1.1 degrees Celsius, but it is still possible to stabilize the climate at 1.5 degrees Celsius. This level of heating will still lead to increased heat waves, intensified storms, and more severe droughts and floods, but the risk is much lower than 2C.
Richard Allen, professor of climate science at the University of Reading and lead author of the IPCC, said that every part of the degree of warming is crucial. "You are promoting mild extreme weather events to the Super Extreme Events Alliance [the temperature rises further]," he said.
In recent months, the frequency, scale and intensity of scorched and submerged climatic disasters in many parts of the world have continued to increase. This is the result of inaction in the past. Unless world leaders finally start to act on these warnings, things will get worse.
This is not for scientists to warn the first generation of world leaders about the severity of the climate crisis, but they are the last to ignore them.
This is a severe assessment of the terrible future that awaits us, if we do not act. As the world is on the brink of irreversible harm, every part of the degree of warming is important to limit the danger.
Even if the world manages to limit warming to 1.5 degrees Celsius, some of the long-term effects of warming that are already in the making may be inevitable and irreversible. These include rising sea levels, melting Arctic ice, and ocean warming and acidification. According to IPCC scientists, drastically reducing emissions can avoid more severe climate change, but it will not restore the world to the milder weather patterns of the past.
We are already experiencing climate change, including more frequent and extreme weather events, many of which can no longer return.
This report shows that the closer we are to 1.5C, the more ideal the climate we will live in. It shows that we can stay within 1.5C, but only if we reduce emissions in the next ten years.
If we don't do this, 1.5C will be impossible by the time of the next IPCC report at the end of this decade.


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