Disease is the #1 cure for over population in all ecosystems... people are no different than animals it's not an if it's a when..over breading, lack of resources and lack of natural predators, over crowding, generational defects all bad signs in any ecosystem and humans check all the boxes...if you look at the numbers the inevitable decline of man started 100 years ago...mankind thinks it's removed from nature and that will be the end of most of the population...your average person can't even cook much less hunt or clean water and will die surrounded by nature bounty because they don't have Google....