Do a bit of research
>But assuming one could wave a wand and banish all CO2 from the atmosphere, it's unknown if this would significantly effect global temperatures.
It's pretty well known that if you cut the CO2 content to zero, it _would_ affect temperatures.
Using IPCC numbers, for example, you get a reduction of about 3 deg C to 7 deg C (out of a total greenhouse warming of 33 C, water vapor being the largest contributor).
http://www.realclimate.org/index.php?p=142
Find me any credible citation that CO2 does not contribute to increasing the Earth's average surface temperature.