A decision by Microsoft Corp. to leave a local utility and buy its own renewable power raises a question for other big companies: If your goal is to green the grid, is it better to act on your own or to work within the system?

There's a lot of hoopla surrounding the Department of Energy's upcoming study on baseload power. But Rick Perry's department has relatively little ability to shape the future of America's electric grid.

Environmentalists are expressing growing alarm over the future of America's sole regional cap-and-trade program, saying the nine Northeastern states that constitute the compact appear increasingly open to a modest reduction in the program's emissions cap.

If Donald Trump is not interested in climate change, a growing number of American governors, mayors and CEOs are. But their pinpoint efforts on global warming raise a nagging question: How much carbon can they really cut?

Colorado Gov. John Hickenlooper announced a plan yesterday to join another dozen states seeking to comply with the Paris climate accord.