The Environmental Protection Agency will hold four public hearings next week to hear from people across the country on its carbon pollution standards.

The agency said in an advisory on Wednesday that the outreach leading up to its proposal has been "unprecedented" and that so far the agency has received roughly 300,000 comments on the new rules, which call for on the nation's fleet of existing power plants to cut carbon dioxide pollution 30 percent by 2030 from 2005 levels.

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