I've been researching the history of conservation in the USA...and I think current doomers would benefit from knowing just how bad things got throughout the 20th century.
The eastern USA's natural environments were fucking razed. We went scorched earth on everything.
In the 1930's, DEER and WILD TURKEYS were almost eliminated from my state. Deer. Wild turkeys. Common animals that you can see all the time.
I've seen animals close to my home that a person in the 1970's would not have been able to see. I saw river otters and a bald eagle a couple months ago! Farmer family friend remembers when a bald eagle sighting here made the news. There is a thriving population of elk (16,000 animals) in the Appalachian Mountains, for the first time since before 1850!
We actively tried to exterminate so many species. Bison. Wolves. Mountain lions. The US GOVERNMENT PAID PEOPLE TO KILL CARNIVORES. They're still here. They're reclaiming their old territories. All is not lost