Effect of human beings on Nature 32 Ecology 6 Environmental protection 4 Human ecology 4 Environmental policy 3 Human beings 3 Mais ... Conservation of natural resources 2 Deforestation 2 Effect of climate on 2 Geography 2 History 2 Physical geography 2 Adaptation (Physiology) 1 Agricultural colonies 1 Atmospheric ozone 1 Bibliography 1 Botany 1 Civilization, Modern 1 Climatic changes 1 Climatology 1 Congresses 1 Description and travel 1 Economic conditions 1 Effect of environment on 1 Effect of water pollution on 1 Endangered species 1 Environmental ethics 1 Environmental monitoring 1 Fishes 1 menos ...