Associated Press: The Obama administration on Monday will unveil a plan to cut earth-warming pollution from power plants by 30 percent by 2020, setting in motion one of the most significant actions to address global warming in U.S. history. The rule, which is expected to be final next year, will set the first-ever national limits on carbon dioxide, the chief gas linked to global warming from U.S. power plants. They are the largest source of greenhouse gases in the U.S., accounting for about a third of the annual...