...and a consequence of living in dense concrete "jungles" is increased energy consumption to cool ourselves, further increasing average global temperatures. What might the consequences be of living amongst trees (and plants in general) and spending much more of our time meeting our basic needs by moving around on the earth under our own power?

>We make cities look like concrete blocks in order to have dense housing and protect the little forest land we have left.

Akshually we don't. We used to do that but not anymore. Unless you have obscene cash to buy offsets and credits and whatnot you can't get approved for anything even remotely close to an old school 1970s concrete jungle site plan.