President Barack Obama's plan to cut greenhouse gas emissions from U.S. power plants, due to be announced on Monday, will win muted applause abroad with some hopes it could help a U.N. deal to fight climate change in 2015. Emerging economies including China and India are likely to be lukewarm because they have often said that Obama's plans for emissions cuts until 2020 - even if fully implemented - are far short of the curbs they say are needed by the rich. But the U.S. plan to limit emissions by existing power plants could put pressure on other nations in U.N. talks on a deal meant to be agreed at a summit in Paris in late 2015. Obama's plan will be a "good signal" for Paris by showing that "one of the world's biggest emitters is taking the future of the planet and its people seriously…