I tripped over this video:
I never agree with everything someone says on a controversial subject, but he makes some good points. The "extreme" or "perfection" could be the excuse for not aiming for a more realistic version of a renewable world.
The images he showed and the information he covered was still very "big city" focused. I think many of us are of the opinion that most of our cities are broken - too big, too energy dependent, and too fragile if the s--t really hits the rotary impeller. We have to consider who benefits from these concrete jungles, and who are struggling within them, and help the struggling to see ways to help themselves even if that's as basic as learning to cook a little and grow sprouts on their window ledges. Many apartment dwellers already have a houseplant or three. Why can't those houseplants be a mini-tomato plant with some walking onion sharing the pot?