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.

Extracting oil from the tar sands is a nasty, polluting, energy-intensive business.

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

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

Bloomberg is famously impatient with beltway politics and believes that to get anything done you need to work from the ground up.

Have we failed to slow global warming pollution in part because climate and environmental activists have been too polite and well behaved?

When it comes to climate and energy, Gates is a radical consumerist. In his view, energy consumption is good - it just needs to be clean energy.