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Recycling
Nontropical Forests and Land Use Issues
Resources from the Sea
Fisheries
Impact of Humans on the Sea; Harvesting
Impact of Humans on the Sea; Pollution
Pfisteria
Biodiversity
Extinction Issues
Extinction and Marine Habitats
Tropical Forests and Extinction
North American Habitats and Extinction Issues
Conservation and Management of Habitats and Species
Global Warming
Air Pollution
Acid Deposition
Water Pollution