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Obama Said to Issue Sweeping Two-Tiered Rule on Emissions

The Obama admistration will propose a two-tiered regulation limiting U.S. carbon emissions from power plants while giving states broad leeway in how to achieve the cuts, according to people familiar with the proposal.

The plan will include a range of options and seek modest reductions in the next five years and as much as 25 percent over 15 years, according to the people who requested anonymity before the announcement.