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1. Global CO2 levels fluctuate between .036 -.038% of total planetary atmospheric gasses. 2. Advocates of AGW hypothesis support lowering plantery levels of CO2. 3. CO2 is essential for plant metabolism. 4. If planetary CO2 levels fall nearer to 0%, then the metabolism of naturally occurring flora will be challenged. 5. Therefore, advocates of AGW hypothesis support challenging plant metabolism on a planetary scale. (Obviously, there are other natural sources of CO2, and it would be unlikely for planetary CO2 levels to ever fall to 0% -- but it's a way of pointing out to the "anti-carbon zealots" that as CO2 lessens from it's already trace amounts, plant life on a planetary scale will suffer.)