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What Is the Biosphere?
Why Do Uncontrolled Population
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acid precipitation activities agriculture air pollution Aldo Leopold amount animals aquifer biocentric biological biosphere carbon carbon dioxide cause chemical Clean coal conservation consumers consumption contain cost countries crops cultural resources damage degradation dioxide diversity earth ecological ecological economics economic ecosys ecosystem effects electricity emissions energy environment environmental problems erosion ethic example factors federal fertility Figure fish Forest Service fossil fuels global groundwater groups habitat hazardous waste heat hectares human health important increase industry lakes land landfills LDCs levels living major materials ment minerals National Forest National Park natural systems nitrogen nuclear nutrients ocean organisms percent plants population growth production programs protect radiation radioactive rain forests recycling reduce rivers ronmental soil solid waste sources species substances sulfur sulfur dioxide Superfund supply tion toxic trees trophic level United wetlands whales wilderness areas wildlife