Current discussions of renewable energy resources often fixate on finding replacements for the highly concentrated fossil fuels and abundant electricity that plays so large a role in contemporary lifestyles in the industrial world. The forms of energy that are actually required to maintain a comfortable human life, by contrast, are food and relatively diffuse heat for cooking, water heating and space heating, and these latter are much easier for individuals to provide for themselves using renewable resources. Moving away from dependence on concentrated energy, however, requires certain adjustments — one of which involves facility with a caulk gun.