Compared to coal, which generates almost half the electricity in the United States, natural gas is indeed a cleaner, less polluting fuel. But compared to, say, solar, it's filthy. And of course there is nothing renewable about natural gas.

Some studies have shown that natural gas could, in fact, be worse for the climate than coal.

One thing you can say about nuclear power: the people who believe it is the silver bullet for America's energy problems never give up.

President Obama is in no danger of being judged by history as an eco-radical.

Geoengineering - the deliberate, large-scale manipulation of the earth's climate to offset global warming - is a nightmare fix for climate change.

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