"Dylan Smith" wrote in message
...
On 2006-07-01, Matt Barrow wrote:
1) What percentage of annual CO2 production is human caused and what
portion
is natural?

Human production is around 3% of annual planetary CO2 production.

Very good!!

Follow-up: What is the most common greeenhouse gas and what is the breakdown
on human vs. natural sources?


2) What are the short-term and long-term effect of CO2 concentrations?

Ice core records going back hundreds of thousands of years plus other
evidence show that global temperature closely correlates with CO2
levels.

Yes, with a rather large delay; IOW, warming CAUSES CO2.