Climate catastrophe ’getting closer’
Güncelleme Tarihi:
PARIS - The world faces a growing risk of "abrupt and irreversible climatic shifts" as fallout from global warming hits faster than expected, according to research by international scientists released Thursday. Global surface and ocean temperatures, sea levels, extreme climate events, and the retreat of Arctic sea ice have all significantly picked up more pace than experts predicted only a couple of years ago, they said.
The stark warning comes less than six months before an international conference aiming to seal a treaty to save the planet from the worst ravages of global warming. A 36-page document summarized more than 1,400 studies presented at a climate conference in March in Copenhagen, where a United Nations meeting will be held in December to hammer out a successor to the Kyoto Protocol. Kyoto expires in 2012.
The report said greenhouse gas emissions and other climate indicators are at or near the upper boundaries forecast by the U.N. Intergovernmental Panel on Climate Change, or IPCC, whose 2007 report has been the scientific benchmark for the troubled U.N. talks. There is also new evidence that the planet itself has begun to contribute to global warming through fall out from human activity.
Urgent steps needed
Huge stores of gases such as methane trapped for millennia in the Arctic permafrost may be starting to leak into the atmosphere, speeding up the warming process. The natural capacity of the oceans and forests to absorb CO2 created by the burning of fossil fuels has also been compromised, research has shown. The new report, written and reviewed by many of the scientists who compiled the IPCC document, calls on policy makers to take urgent steps to keep average global temperatures from increasing more than two degrees Centigrade (3.6 degree Fahrenheit), compared to pre-industrial levels.
"Rapid, sustained, and effective mitigation ... is required to avoid 'dangerous climate change' regardless of how it is defined," it said. "Temperature rises above 2 C will be difficult for contemporary societies to cope with, and are likely to cause major societal and environmental disruptions through the rest of the century and beyond." The IPCC has said that achieving this goal would require industrialized nations to slash greenhouse gas emissions by 25-40 percent compared to 1990 levels. The new report suggested that deep and early emissions cuts are essential. "Weaker targets for 2020 increase the risk of serious impacts, including the crossing of tipping points" beyond which natural forces begin to push up temperatures even faster.