We consume more resources than we generate.
SOME resources we are using up, but we're not going to run out of "resources", ever.
There are areas humans shouldn't live in as many numbers as they live, but that's really only a problem for the people living in those areas. They can move to places more suitable to human beings, as they should.
I'm going to need a cite for that too. And where? Certainly not where I live, you know, 'murica, with all our waste and guns, you'd think there wouldn't be anything left alive if you listen to a certain group of people. Sure, some species are under more pressure than they were 40 years ago, other species are doing a lot better.
and it will have to be tackled.
We are certainly over populated in certain areas, but the planet can hold, feed, shelter, clothe and entertain a LOT of people.