Global environmental change Climatic changes 35 Environmental aspects 31 Environmental protection 16 Effect of human beings on 13 Global warming 13 Nature 13 Environmental policy 11 Globalization 10 Environmental monitoring 8 Human ecology 8 Pollution 8 Economic aspects 7 Government policy 7 Environmental degradation 6 Human beings 6 Environmental management 5 Environmental sciences 5 International cooperation 5 Climatology 4 Effect of climate on 4 Environmental conditions 4 Land use 4 Life sciences 4 Remote sensing 4 Social aspects 4 Technological innovations 4 Economic development 3 Economic history 3 Greenhouse gas mitigation 3