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

Americans don't pay much attention to environmental issues, because they aren't sexy. I mean, cleaning up coal plants and reining in outlaw frackers is hugely important work, but it doesn't get anybody's pulse racing.

Coal boosters like to tout coal as cheap and plentiful - well, not anymore. At least not in China.

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.

Bill Gates is a relative newcomer to the fight against global warming, but he's already shifting the debate over climate change.

It may be too late for West Virginia to save itself from the ravages of Big Coal. But it's not too late for America.

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.