• President Barack Obama speaks about his Clean Power Plan, Monday, Aug. 3, 2015, in the East Room at the White House in Washington. The president is mandating even steeper greenhouse gas cuts from U.S. power plants than previously expected, while granting states more time and broader options to comply. (AP Photo/Andrew Harnik)

    Who wins and loses under Obama’s stricter power plant limits

    WASHINGTON (AP) — President Barack Obama sought to clamp down Monday on power plant emissions with a federal plan that — if successful — would attempt to slow global warming by dramatically shifting the way Americans get and use electricity.

    Updated: 5:23 pm

  • In this Jan. 20, 2015 file photo, a plume of steam billows from the coal-fired Merrimack Station in Bow, N.H.  President Barack Obama on Monday, Aug. 3, 2015, will unveil the final version of his unprecedented regulations clamping down on carbon dioxide emissions from existing U.S. power plants. The Obama administration first proposed the rule last year. Opponents plan to sue immediately to stop the rule's implementation. (AP Photo/Jim Cole, File)

    Obama to mandate steeper emissions cuts from US power plants

    WASHINGTON (AP) — Aiming to jolt the rest of the world to action, President Barack Obama moved ahead Sunday with even tougher greenhouse gas cuts on American power plants, setting up a certain confrontation in the courts with energy producers and Republican-led states.

  • In this Jan. 20, 2015 file photo, a plume of steam billows from the coal-fired Merrimack Station in Bow, N.H.  President Barack Obama on Monday, Aug. 3, 2015, will unveil the final version of his unprecedented regulations clamping down on carbon dioxide emissions from existing U.S. power plants. The Obama administration first proposed the rule last year. Opponents plan to sue immediately to stop the rule's implementation. (AP Photo/Jim Cole, File)

    Obama to unveil final power plant emissions limits on Monday

    NEW YORK (AP) — President Barack Obama will impose even steeper cuts on greenhouse gas emissions from U.S. power plants than previously expected, senior administration officials said Sunday, in what the president called the most significant step the U.S. has ever taken to fight global warming.