New York, Shawwal 17, 1436 AH, August 2, 2015, SPA -- President Barack Obama will impose even steeper cuts on greenhouse gas emissions from U.S. power plants than previously expected, AP quoted senior administration officials Sunday, in what the president called the most significant step the U.S. has ever taken to fight global warming. A year after proposing unprecedented carbon dioxide limits, the Obama administration was poised to finalize the rule at a White House event on Monday. Obama, in a video posted to Facebook, said the limits were backed up by decades of data and facts showing that without tough action, the world will face more extreme weather and escalating health problems like asthma. -- SPA 10:17 LOCAL TIME 07:17 GMT www.spa.gov.sa/w