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Among the many features of this fourth edition: New graphics and photographs.Expanded coverage of abiotic factors including water, air, insolation, precipitation, soils, nutrients, ionizing radiation, and fire.Updated and expanded coverage of energy flow (with increased emphasis on decomposition), biogeochemical cycling, and population and community ecology.Expanded section on human ecology with separate chapters on the human population and anthropogenic impacts on terrestrial and aquatic ecosystems and the atmosphere.An introduction to ecological ethics.Literature citations incorporated into the text and an amalgamated list of references.A listing of key words and key points for each chapter.