Accounting for nature -- Agriculture -- Air pollution and greenhouse gases -- Alternative fuels -- Amazon Deforestation -- Amazon River -- Amphibians -- Anthropocentrism -- Antienvironmentalism -- Aquifers -- Balance of nature -- Beach erosion and sand mining -- Bees and other pollinators -- Biocentrism -- Biodiversity -- Biodiversity action plans -- Biogeography -- Biomagnification -- Biomes -- Biopesticides and bioassays -- Bioprospecting and biopiracy -- Bioregionalism -- Bioremediation -- Biosphere -- Boreal and cloud forests -- Brownfields -- Carbon cycle and carbon footprint -- Carbon dioxide air capture -- Carbon trade -- Carcinogens -- Cattle -- Clean Air Act -- Clean Water Act -- Climate Change -- Climate change and human health -- Climate change skeptics -- Conference of the Parties -- Coral reefs -- Cultural ecology -- Dams and reservoirs -- Dead zones -- Deep ecology -- Deforestation -- Desalination -- Deserts and dunes -- Dichloro-diphenyl-trichloroethane (DDT) -- Drought -- Dust Bowl disaster -- Earth Day -- Eat Local movement -- Ecocentrism -- Eco-fashion -- Ecofeminism -- Ecological economics -- Ecological footprint -- Ecology as concept and in history -- Ecotourism -- Electronic waste -- Endangered species -- Environmental determinism -- Environmental ethics -- Environmental justice and racism -- Erosion -- Estuaries -- Fisheries -- Floodplains -- Fossil fuels -- Genetic modification -- Glacial melting -- Global warming -- Globalization -- Grasslands -- Green buildings -- Groundwater pollution -- Habitat destruction -- Hazardous wastes -- Hydraulic fracturing (fracking) -- Indicator species -- Intergenerational Environmental Justice -- Intergovernmental Panel on Climate Change (IPCC) -- International Nature Preservation Policies -- Land-use policy -- Light pollution -- Marine life -- National forests -- National parks -- Noise pollution -- Nuclear accidents -- Nuclear power industry -- Ocean debris -- Oceans and rising temperatures -- Oil drilling -- Oil shale and tar sands -- Oil spills -- Organic farming and gardening -- Ozone layer -- Population -- Population control and social justice -- Recycling -- Renewable energy -- Rising sea levels -- Road systems -- Severe and anomalous weather -- Smog and heavy metals -- Species loss and the Sixth Extinction -- Tidal energy -- Tragedy of the commons -- Urban rain gardens and greenbelts -- Urban sprawl and urban ecology -- Water pollution -- Watersheds -- Wetlands -- Wilderness areas -- Wildlife refuges -- Wind energy.