Quote from jem:
you are missing the basic point.
If the earth is naturally in a warming trend. And the warming precedes CO2 rise.
Then man's contribution to an already established feedback loop could be inconsequential.
Whats funny about this is that Water Vapor is the most significant greenhouse gas but you can't tax Water so CO2 will have to do.
"The contribution to the greenhouse effect by a gas is affected by both the characteristics of the gas and its abundance. For example, on a molecule-for-molecule basis methane is about eight times stronger greenhouse gas than carbon dioxide[6], but it is present in much smaller concentrations so that its total contribution is smaller. When these gases are ranked by their contribution to the greenhouse effect, the most important are:[7]
water vapor, which contributes 36â72%
carbon dioxide, which contributes 9â26%
methane, which contributes 4â9%
ozone, which contributes 3â7% "
http://en.wikipedia.org/wiki/Greenhouse_gas