Last updated: 6 Nov 2021 | 834 Views |
Human activity is changing the climate in unprecedented and sometimes irreversible ways, a major UN scientific report has said. The landmark study warns of increasingly extreme heatwaves, droughts and flooding, and a key temperature limit being broken in just over a decade. The report "is a code red for humanity", says the UN chief. But scientists say a catastrophe can be avoided if the world acts fast. There is hope that deep cuts in emissions of greenhouse gases could stabilise rising temperatures.
Echoing the scientists' findings, UN Secretary General António Guterres said: "If we combine forces now, we can avert climate catastrophe. But, as today's report makes clear, there is no time for delay and no room for excuses. I count on government leaders and all stakeholders to ensure COP26 is a success."
The sober assessment of our planet's future has been delivered by the UN's Intergovernmental Panel on Climate Change (IPCC), a group of scientists whose findings are endorsed by the world's governments. Their report is the first major review of the science of climate change since 2013. Its release comes less than three months before a key climate summit in Glasgow known as COP26.
According to Prof Ed Hawkins, from the University of Reading, UK, and one of the report's authors, the scientists cannot be any clearer on this point. "It is a statement of fact, we cannot be any more certain; it is unequivocal and indisputable that humans are warming the planet." Petteri Taalas, Secretary-General of the World Meteorological Organization, said: "By using sports terms, one could say the atmosphere has been exposed to doping, which means we have begun observing extremes more often than before."
The authors say that since 1970, global surface temperatures have risen faster than in any other 50-year period over the past 2,000 years. This warming is "already affecting many weather and climate extremes in every region across the globe". Whether it's heatwaves like the ones recently experienced in Greece and western North America, or floods like those in Germany and China, "their attribution to human influence has strengthened" over the past decade.
Source and figures : https://www.bbc.com/news/science-environment-58130705