It is one of the most significant actions ever take by the U.S. government on global warming, and the EPA said it needed more time to get it right.
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The Environmental Protection Agency on Tuesday gave the public 45 more days to weigh in on a plan that would for the first time curb the pollution blamed for global warming from the nation’s coal-fired power plants. The agency said it was still aiming to finalize the rules by next summer.

The agency has already received 750,000 comments on the plan it unveiled in early June, which proposes a 30 percent cut in carbon dioxide pollution by 2030 from 2005 levels. It is one of the most significant actions ever take by the U.S. government on global warming, and the EPA said it needed more time to get it right.