The warming is not unprecedented compared to anytime in history,
I didn't say the warming was unprecedented. I said the rate of warming is unprecedented. And this is the problem. Our atmosphere and oceans have risen in temperature more over the past 100 years than it has in the past 100,000 years. The earth goes through natural cycles of warming and cooling - over geological spans. Not human lifetime spans.
This is a problem because it doesn't give ecosystems time to adapt results in mass extinctions, desertification, and stronger and stronger weather systems (i.e. less habitable to humans).