I'm quite willing to believe that greenhouse gases warm the atmosphere, but I've always wondered how large the effect is compared to the other things that change the climate. Since the earth has been both hotter and colder than it is now, before we even existed, it seems possible that the increase of CO2 from people might not be all that big of a factor. Does anyone have any information along these lines?
If we must take everything in order of most important to least important, then doing anything that doesn't affect this most important thing is a colossal waste of time.
If we are affecting the temperature of the planet in a way that will make it uninhabitable to us, it behooves us to do anything and everything we can to make our impact less. Whether or not it is the biggest contribution to the problem. Plus, solving the smaller problem may give us insights to the larger problem.
