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The World Wildlife Fund 19621977
Engineering in Agriculture 3 7
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achieve activities agricultural areas argument become behaviour believe better birds blue whale cerned cities civilisation concerned consequences conservation movement conservation of nature cost Countryside in 1970 create creatures demands destruction difficult dilemma earth economic effect effluents everything extermination face fact factors forests future growing growth habitat happen human environment human existence human population immense important increase individual industrial inevitable interest Lake Pedder land land reclamation large number LONDON mankind material means mechanisation ment million modern moral natural environment natural selection nomic obvious organisation parks particularly passenger pigeon perhaps pests Peter Scott plants pollution possible problem protection Rachel Carson realise reason recognise recreation responsible restrictions revolution rivers Silent Spring situation social sort species strators structure survival things tion transport urban whole wild animals wild populations World Wildlife Fund