And that's the problem. We don't have control of the climate, but can effect it. What happens after we add our effect is all theoretical and unknown. We don't have a very complete understanding of the complete ecosystem and that's why we have to study it, not bury our heads in the sand pretend it's all OK no matter what we do. The evidence so far does show we are having an effect. The theories presented pre-port that our effect on the climate is not beneficial to mankind. More study is needed so that we can have a better understanding. You're right, mother nature could wipe us out any time, but like the huge random meteorite speeding towards us to cause our demise, wouldn't be better to know that there are meteorites, that they can kill us all, how to look for them and come up with a plan to save ourselves just in case one should come? Shouldn't we give ourselves a fighting chance rather than except fate?