Section 4 (of 15):
Earth, environmental, durability, energy, nature.
Earth, geography, compass, weather, environmental pollution, apocalypse, overpopulation, consumer society, pesticides, durability, awareness, negative growth, everything in moderation, nature conservation, recovery, approach, recycling, cradle to cradle, paper savings, consumers cut back, alternative way of life, energy, electricity, fossil fuels, gasoline, saving energy, green energy, waterworks, water, nature, trees, animals.
