Subject(s): Conserving soil -- Environment conservation -- Resource shrinking and energy related structural adjustments -- Stabilizing population , Zero population growth, Reducing dependence , Conservation contribution, Petroleum substitutes, Government Regulation and incentives , Oil prospect -- Conserving soils, Protecting forests , acid rain, Deforestation, sustainability -- Recycling materials : waste paper, recovering alumina, iron and steel, recycling society -- Reassessing the economics of nuclear power around the world -- Developing renewable energy : wind energy, Geothermal energy development, Solar energy -- Reconsidering the automobile's future : Fuel efficiency, Alternate fuels -- Securing food supplies , Reshaping economic policies