Nature World: President Barack Obama unveiled his proposal Monday to slash carbon dioxide pollution from power plants 30 percent by 2030, one of the strongest actions ever taken by the United States government to fight climate change.
The 645-page regulation, proposed by the Environmental Protection Agency (EPA) and expected to be final next year, takes fire at coal, one of the nation's largest sources of carbon emissions. It is Obama's last opportunity to make a significant impact on global warming after failing...