Environmentalist thought & ideology Social impact of environmental issues 24 The environment 23 Ecological science, the Biosphere 16 Conservation of the environment 11 Earth sciences, geography, environment, planning 7 Society & social sciences 6 Environmental economics 4 Animals & nature in art (still life, landscapes & seascapes, etc) 3 Geography 3 Literary reference works 3 Natural disasters 3 Social & political philosophy 3 Social issues: environment & green issues (Children's / Teenage) 3 Conservation of wildlife & habitats 2 Environmental monitoring 2 Food security & supply 2 Forestry & silviculture: practice & techniques 2 History of science 2 Interdisciplinary studies 2 Media studies 2 Political economy 2 Sustainability 2 Sustainable agriculture 2 Theory of art 2 Agriculture & farming 1 Anthropology 1 Applied ecology 1 Archaeological theory 1 Cultural studies 1