The story

Leaders of the world's most powerful economies pledged to seek huge cuts in their greenhouse gas emissions at a summit in Italy on Wednesday.

The Group of Eight leaders said they would "join a global response to achieve a 50 percent reduction in global emissions by 2050 and to a goal of an aggregate 80 percent or more reduction by developed countries by that date."

The goal mirrors one adopted by the U.S. House of Representatives last month. Read full article »

CNN's Paula Newton contributed to this story

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