> It's not much comfort to the people of California if the Earth remains habitable on average when the Sierra snowmelt disappears and the state faces a drought of unprecedented proportions.

It's a really long discussion, but our ability to locally adapt to climate change is actually quite good and improving regularly. Temperatures are rising really, really slowly - you can get the 2-3 degrees per 100 years back by planting trees and irrigating. Desalination has come along incredibly fast too. I can go into greater detail if you have specific questions, I know a fair bit about this stuff.

> Where do you get that CO2 is 0.3% of greenhouse gases?

"Carbon dioxide (chemical formula CO2) is a chemical compound composed of two oxygen atoms covalently bonded to a single carbon atom. It is a gas at standard temperature and pressure and exists in Earth's atmosphere in this state. CO2 is a trace gas being only 0.038% of the atmosphere."

http://en.wikipedia.org/wiki/Carbon_dioxide

I think a lot of people forget that CO2 is naturally occurring and necessary for life.

Also of note:

http://en.wikipedia.org/wiki/IPCC_list_of_greenhouse_gases

http://en.wikipedia.org/wiki/Greenhouse_gas#Greenhouse_effec...

Wikipedia has CO2 accounting for between 9% and 26% of the greenhouse effect, the citation was from the American Meteorological Society.