"Progress in reducing global greenhouse-gas emissions has been slow," the academies said in a statement targeting leaders at July 7-9 summits in Japan. They called on G8 leaders to honour a 2007 agreement to "consider seriously" the goal of halving world greenhouse-gas emissions by 2050.
The academies, including the US National Academy of Sciences and the Chinese Academy of Sciences, also urged work on technologies for carbon capture and storage technology.
Leaders should aim by 2009 to have "a timetable, funding and a coordinated plan for the construction of a significant number of carbon capture and storage demonstration plants", the statement said.
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