human 187 Humans 119 The environment 117 female 112 male 106 article 93 Earth sciences, geography, environment, planning 92 adult 89 Conservation of the environment 83 Article 81 China 79 Environment 79 environment 71 Climate change 66 controlled study 65 Ecosystems 59 Female 56 Sustainable development 55 Male 52 Environmental management 46 human experiment 45 social environment 44 marine environment 41 Ecology 39 Sustainability 37 Environmental economics 36 Malaysia 36 Biodiversity 35 Environmental science, engineering & technology 35 major clinical study 35