I won't try to change your mind because that is correct, however it doesn't automatically mean that the climate is not changing now due to man made factors. We had the same with the ozone layer, changed our behaviour and viola the whole in the ozone layer has shrunk over the last 20 years. (Trust me, that is a good thing)
Now I am not saying that I believe the current average global rise in temperatures is 100% man made, as the weather cycle and global temp are a huge system. It could be that we contribute 90% or 20% to the current warming, but it is something we should take seriously.