[greenhearth]

I don't think cavemen exterminated entire jungles and poisoned plankton with plastic.

[Bnichs]

One of the first things we have early humans doing on record is burning down forests: https://www.scientificamerican.com/article/people-may-have-u...

[sfn42]

On a much smaller scale though, now we do it industrially. Burning all the fossilized old forests we can dig out of the ground - which is even worse because they were no longer part of the carbon cycle.