Bloomberg's $50 million is not going to revolutionize the electric power industry. But his willingness to fight is already inspiring others to see Big Coal differently.

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

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

In the Arctic, things are already getting freaky. Temperatures have warmed three times faster than the global average.

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.

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

Climate change is a global issue - from the point of view of the Earth's climate, a molecule of CO2 emitted in Bejing is the same as a molecule emitted in Sydney.