Obama poised to unveil major climate change plan

With one eye on his legacy, US President Barack Obama will Monday unveil what he called the "biggest, most important step we've ever taken" in the fight against climate change. The White House will release the final version of America's Clean Power Plan, a set of environmental rules and regulations that will home in on pollution from the nation's power plants, setting limits on power-plant carbon emissions for the first time. Plants will have to reduce carbon dioxide emi