Environmental aspects Environmental conditions Ecology 93 History 71 Social aspects 38 Social conditions 33 Environmental policy 32 more ... Economic conditions 22 Effect of human beings on 22 Environmentalism 22 Nature 22 City planning 20 Human ecology 18 Political aspects 17 Urbanization 16 Environmental protection 15 Economic aspects 14 Politics and government 14 Urban ecology (Sociology) 14 Economic development 13 Environmental degradation 12 Pollution 12 Sustainable development 12 Climatic changes 11 Government policy 11 Economic history 10 Health aspects 9 Land use 9 Social conflict 9 Petroleum industry and trade 8 less ...