President Barack Obama unveiled the final version of his plan to cut emissions from U.S. power plants Monday, flanked by parents of pediatric asthma patients, medical professionals and Environmental Protection Agency officials. Calling it the “single most important step” America has taken to fight climate change, Obama outlined a plan that the White House said will help to reduce 90,000 asthma attacks in children by 2030, as well as prevent premature deaths related to power plant emissions and cut down on missed school and work days.

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