Humans have always been a disaster for the environment they move into. We drove mammoths to extinction over 10,000 years ago. Australia used to have large numbers of megafauna species which the aborigines killed off tens of thousands of years ago. Humans would use fire to burn their prey out of hiding (and destroying their habitat in the process), then just move off to the next habitat once everything was burned up.

Humans being a destructive force to the ecosystems we depend on is definitely not a new thing.