That's just a way of investing an unsubstantiated claim with respectability. "Scientific evidence" can be made to "prove" whatever you want it to.
Let it happen?
We have zero control over planetary-scale events.....global warming and cooling cycles have being occurring long before we came along.
Its not just sheer numbers. Per capita resource consumption is also on the rise - everywhere. I believe this is the crux of the matter, its why we are damaging this planet. But the problems of uncontrolled population growth are hardly even being recognized yet, perhaps due to the multiple, and highly sensitive, issues involved.
Its an illusion to believe that biodegradable plastic bags, solar panels and electric cars are going to allow us to maintain the present status quo indefinitely. IMHO, the current obsession with eco-trivia is itself a denial of a harder reality.
And as for worrying about a dry year in Chile:
The territory of Central Chile has been affected by long-term droughts in 1280–1450, 1570–1650 and 1770–1820