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The critical challenge; humans and earth - the great experiment; global cycles and systems - the environmental framework; ecosystems and the bioclimatic environment; the human population - trends and patterns; agriculture, food production and hunger; energy generation, use and environment; the atmospheric environment and land use; air pollution - patterns, trends and impacts; the hydrologic environment and land use; water pollution - patterns, trends and impacts; hazardous waste production and disposal; soil, land and land use; biological diversity and land use; open land resource - forests, rangelands, parks and preserves; managing the environment; appendices.