The success of a global climate-change deal will hinge on developed countries supporting greater emission cuts, said John Ashe, chairman of a United Nations work group. His statement comes as current pledges still fall short of the 25% to 40% range below 1990 levels needed to prevent the worst of climate change, as recommended by U.N. scientific advisers. Rich countries, except for the U.S., have so far committed to total cuts of between 15% and 21% by 2020, according to data from the U.N. Climate Change Secretariat.
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