First of all, do you actually know anything about ice ages? have you studied them? Because it really seems like you haven't.
The major driving force behind ice ages isn't george bush, or SUVs. What is thought to cause them is something called Croll-Milankovitch cycles, these are changes in the earths orbit that can reduce or increase the amount of insolation energy the earth receives. Graphs comparing these cycles to ice ages show a very positive correlation. Incidentally these cycles don't occur over millions of years, the longest is around 125'000. Notice I didn't use the word 'proof' nor did I in my other post. Proof is a highly subjective term. If you want to start arguing about the philosophy of science we can do it in another thread.
I didn't say anything about the entire scientific community agreeing either, I said 'pretty much the entire scientific community' because people will always disagree. Don't put words into my mouth just so you can look like you're right about something.
As for the Earths abilty to heal itself, I'm not underestimating it, I don't fully understand it, no-one does, but I would wager that I know more about environmental feedback loops and thresholds than you do. This is beside the point anyway, damaging the earth and hoping it can sort it out isn't a sustainable policy.
I'm saying you and your friend are ignorant because you don't seem to know what you're talking about, you haven't looked into the science behind climate change, you don't even seem to understand the basic principles. The only conclusion I can draw is that you've been taken in by someones propaganda machine, exactly like you accused me of being.