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

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.

It's not all Obama's fault: His plans to rebuild America's energy infrastructure have been hampered by the recession, and his efforts on global warming have been stymied by Tea Party wackos and weak-kneed Democrats in Congress.

When it comes to global warming, coal is the gorilla in the room.

In the United States, we do a pretty good job of protecting iconic landscapes and postcard views, but the ocean gets no respect.

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.