I don't pretend to know much about the scientific basis of the global warming debate, but I am trying to educate myself. So this news story caught my eye.
http://www.washingtonpost.com/wp-dyn/content/article/2006/09/04/AR2006090400451.html
http://news.bbc.co.uk/2/hi/science/nature/5314592.stm
I'll summarize:
For the past 800,000 years, CO2 concentration in the atmosphere has ranged from 180ppm to 300ppm. The level today is 380ppm.
In past periods of rising CO2 levels, the rise was very slow, 30ppm per 1000 years. In the past 200 years, CO2 levels have risen very fast, by 100ppm.
The increased CO2 is from fossil fuel origin.
Anyone have good, readable, fact-based URLs to share, on the issue of global warming's cause, existence, and effects, or conversely the lack of same?