11000 years ago.That's just not true. You're confusing Geology with climate I think. The last ice age was 5000 years ago. It was climate change that drove humans out of Africa.
There is this very common myth that without people the climate would be stable. There's more than ample evidence it is a myth though.
That actually doesn't disprove man made climate change, and that's why I was ambivalent.
http://sciencenordic.com/what-makes-climate-change-part-one
Helpful.