For Deep Green fundamentalists there can be no compromise, no middle ground between Deep and Bright Green. JK&W contend “even with steep reductions in our energy-intensive lifestyle, a return to subsistence living, and the best-known permaculture techniques, a city cannot be made sustainable.” They reason that since “cities have existed for less than 5 percent of our time on this planet…Obviously we don’t need cities.” Reality check! Obviously our foraging ancestors had no use for cities on a sparsely populated, biologically rich planet. But do the authors seriously believe our ecologically damaged and depleted planet can support 7.8 billion post-industrial hunter-gatherers?