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abortion Accutane acid addition agricultural air pollution American amount animals areas asbestos atmosphere average babies bacteria biome biotic community birth control birth rates carbon dioxide carcinogens cause cells century chemical chromosome climax community consumers contamination contraceptive countries crop damage death rates dioxin disease doses earth ecological ecosystems effects emissions energy environment environmental factor family planning fertility fish food chain forest fuel growth rates hazard herbicides human health impact increase industry insecticides insects ionizing radiation land lead levels living loss lung cancer Lyme disease major mercury million mutations nations natural nitrogen nuclear power occur organisms outbreaks ozone PCBs pest pesticide plants poisoning population growth pregnancy present problems production radiation exposure radioactive radon recent reduce regions result risk skin smoke soil species spraying substances temperature teratogenic thalidomide Third World tissues toxic trophic levels tropical victims wastes women workers X-rays