Obama outlines second-term environmental priorities in address on climate change
He directs EPA to establish carbon pollution standards for plants
Texas-to-Canada Keystone pipeline in final stages of government review
March poll: 47% think the government is doing too little to protect the environment
President Barack Obama unveiled an aggressive new climate change strategy on Tuesday that would limit pollution from existing coal-fired power plants, and he made clear that approval of the Keystone XL pipeline depended on the project not increasing overall greenhouse gas emissions.