Urbanization, or the move to cities, requires grid electricity, which chapter one discusses, in particular nuclear power. Another two chapters explain the need for genetic engineering. The fourth chapter is a "sermon" on science and large-scale geoengineering. The fifth chapter tackles restoration of natural infrastructure and benevolent ecosystem engineering. Finally, Brand concludes with humans' obligation to "learn planet craft", to enhance life and Earth like an earthworm.Brand 2009, p. 23
