Reuters: President Barack Obama is likely to roll out a number of measures on climate policy, potentially including a strategy to limit greenhouse gas emissions from existing power plants, in a speech on Tuesday, sources familiar with the plans told Reuters. The potential move on power utilities, which account for roughly 40 percent of the nation's carbon dioxide emissions, will come as Obama sets the fight to curb climate change as a priority for his second term. Regulations are still pending on yet-to-be-built...