Biodiversity Ecology 33 Biodiversity conservation 17 Biotechnology 13 Nature conservation 12 Biological Resources (Plant) 11 Forests and Forest Trees (Biology and Ecology) 10 Environment 9 Pollution 9 Sustainability 9 Forests 8 India 8 Natural Resource Economics, (New March 2000) 7 Natural resources 7 Sustainable development 7 Agriculture 6 Biological Resources (General) 6 Economics 6 Human ecology 6 Plant diversity conservation 6 Animal Ecology 5 Climate change 5 Climatic changes 5 Conservation 5 Environmental economics 5 Environmental science 5 Forest management 5 Plant Breeding and Genetics 5 Plant Ecology 5 Social science 5