Grossly stupid? His quote refers to "people in the bush" and,...

Grossly stupid? His quote refers to "people in the bush" and, {universal not specific} "our dams" and "our river systems." That is dams all over and people in a particular set of circumstances (the bush).

Only someone who cannot comprehend the English language would have trouble working this out.

But it is well understood that those that have fallen for the Global Boiling hoax are a particular kind of stupid.