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World history --- Environmental protection. Environmental technology --- Human ecology. Social biology --- Europe --- 502.2 --- 502.56 --- 504 <4> --- Nature study. Observation of nature. Natural history --- Danger and damage other than pollution, from agriculture and industry --- Environment. Environmental science--Europa --- 504 <4> Environment. Environmental science--Europa --- 502.56 Danger and damage other than pollution, from agriculture and industry --- 502.2 Nature study. Observation of nature. Natural history --- Human ecology - Europe - History --- Pollution - Europe - History --- Environmental policy - Europe - History --- Human ecology --- Pollution --- Environmental policy