For better or worse, the bulk of coal industry jobs are in Appalachia - and when that coal is gone, so are the jobs.

Although most Americans don't know it, the U.S. gets more oil from Canada than it does from the entire Middle East.

Some studies suggest that the Arctic Ocean may be ice-free by the end of the century.

Among all the tests President Obama faced in his first term, his biggest failure was climate change.

One of the big questions in the climate change debate: Are humans any smarter than frogs in a pot? If you put a frog in a pot and slowly turn up the heat, it won't jump out. Instead, it will enjoy the nice warm bath until it is cooked to death. We humans seem to be doing pretty much the same thing.

Mark Ruffalo, aka the Incredible Hulk, is the natural gas industry's worst nightmare: a serious, committed activist who is determined to use his star power as a superhero in the hottest movie of the moment to draw attention the environmental and public health risks of fracking.

In reality, Republicans have long been at war with clean energy. They have ridiculed investments in solar and wind power, bashed energy-efficiency standards, attacked state moves to promote renewable energy and championed laws that would enshrine taxpayer subsidies for fossil fuels while stripping them from wind and solar.