Crazy right.. Not only did my college fail me, but so did the other educational institutions that I was involved with.
Curious where you get all your environmental information, and if all you do is read about the bad things and none of the things we are restoring thanks to hardworking scientists and environmental protection agencies. Also, curious if you understand that invasive species and diseases play a role in environmental destruction or if you just chalk it all up to "bad humans".
Go do some reading:
https://neobiota.pensoft.net/