15000 years ago, the ice sheets were melting drastically. This is when we lost many large animals on this continent alone. Such as the Mammoth, Saber toothed Tiger, Saber toothed Lion, Giant Sloth, Dire wolves, Cave bears, etc. etc. etc.
We are still warming up from the same cause that made the ice sheets recede. These had nothing to do with humans. That's just 15000 years ago. If you look at the fossil records, there are hundreds if not thousands of extinction events that have happened all around the world for millions of years. After all, the dinosaurs died in an extinction event 65 million years ago. It is believed that an asteroid hit the earth in the gulf of mexico. That created what is similar to a nuclear winter for around 15 years. This planet was toxic at that point. Still, thousands of species of animals survived. The gases that tore thorugh this planets atmosphere eventually just escaped thorough the hole in the ozone. You know, the one that keeps getting bigger(supposedly)
Global Warming is a Sham!!! Theres my two cents!