*Insert paragraphs here*
I think that you just made my point.
No matter what, humans will pretty much pollute nature and get rid of water and food.
Unless we get smarter later.
From what I gathered all your writing basically says,
"Shortages of these things aren't because of nature but because of human error."
And, uh, a lot of humans are still here. Some of which are insanely stupid and will probably make those errors you pointed out.