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acid rain agricultural amount animals areas atmosphere Bearded Tit birds Black-backed Gull Black-headed Gull Britain cancer carbon dioxide cause cent CFCs Chapter chemical clay co-disposal coal Common Common Gull concentrations concern considerable containing countries cover crops damage dangerous deposited developed dose dumped effluent environment environmental fauna fect feed fertiliser fish gases grass greenhouse heat herbicides important increased industry insecticides insects land landfill leachate Leblanc process less Lesser Black-backed Gull levels of radiation lichens lime litre mainly marsh material methane million tonnes nitrate nitrogen nuclear power numbers occur orchids organisms output oxygen ozone layer particularly pesticides phosphate Pitsea plants poisonous population possible power stations problem produced quarry radioactive reduce refuse tips rise river seed serious sewage shows sludge soil sources species sulphur dioxide surface temperature tion toxic substances trees vegetation Wales Warbler waste disposal wildlife winter