World leaders embraced for the first time on Tuesday an ambitious but nonbinding goal of slashing greenhouse-gas emissions in half by midcentury to stave off global warming. Unimpressed environmentalists called the effort too slow and too uncertain. Leaders of some of the world's richest nations praised the agreement, but one environmental critic suggested that by 2050 those leaders would be forgotten and "the world will be cooked." Details were scant in the statement issued by the Group of Eight. Some could become clearer Wednesday when China, India and six other fast-developing nations sit down with the Group of Eight industrial nations — the United States, Japan, Germany, Britain, Germany, Russia, Italy and Canada — to discuss climate change strategies. The G-8 did not specify a base year for its proposed 50 percent cut,...
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