The United Nations released a major report last week, finding with more certainty than ever before that humans, chiefly through the burning of coal, oil, and natural gas, are a key cause of the Earth’s warmer temperature. What role can the United States play in leading the way on a comprehensive, international approach to addressing global warming? Does the action by the Environmental Protection Agency to regulate greenhouse-gas emissions from power plants help put the United States in more of a leadership position? And could it prompt similar action by other countries? Click here to read more