There is a huge difference between accepting global warming and Accepting that mankind has anything more than the most marginal of an impact on it.
Anyone who doesn't believe global warming is real needs to go back to science class.
Just as anyone who thinks mankind has a noticeable impact on it much less could alter it is a complete fool.
Of course if we did have a major impact the 4 largest reasons would be clear-cutting forests/breathing/flatulence/car exhaust
So if you do believe mankind makes a impact on global warming a highly suggest you quit breeding as your only contributing to the problem.