Global warming: a threshold not to cross


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The average global temperature must not rise beyond 2 ° C higher than before the industrial revolution (or 1750) recommends an international think tank on global warming. Beyond that point, the damage caused by climate warming are catastrophic proportions, says the report prepared by three major think tanks: The Institute for Public Policy Research (Great Britain), The Center for American Progress (USA) and The Australian Institute.

Beyond increased 2 ° C in global temperature, farm losses, risks from water shortages, irreversible damage to ecosystems increases significantly, says ICCT (International Climate Change Taskforce) which is based on data from the UNFCCC, the UN study group for the climate. At this stage, the ice of West Antarctica and Greenland will melt, forests are no longer carbon sinks but sources CO2.

Not to exceed an increase of 2 ° C should be the new focus of world leaders, recommends ICCT.
Concretely, this means maintaining concentration in the atmosphere at CO2 400 ppm. Knowing she reached already 379 ppm, the threshold is not far.



The report of the ICCT is for governments, which must "recognize that climate change is long term the most important issue that the planet faces," according to former British minister Stephen Byers, co-leader of the group. This text will be officially released tomorrow, when Britain takes the lead G8 and the European Union. Tony Blair has made climate one of its priorities.

Among the report's recommendations 10 figure also:
- Create an expanded G8, including developing countries, dedicated to the fight against global warming;
- Bring to 25% share of electricity produced from renewable energy sources;
- Establish a comprehensive action plan for the post including 2012 all countries of the world.

Cecile Dumas (24 / 01 / 05)

http://sciences.nouvelobs.com/



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