History 121 Philosophy 82 Literature 81 Greek drama 60 Green revolution 60 Green movement 48 Environmental policy 43 Novel 43 History and criticism 42 Greek literature 37 Green chemistry 37 Greek 31 Religion 30 Drama 29 Environmentalism 29 Green house effect 29 Green technology 29 Sheep 29 Agricultural economics 28 Economics 28 Greek drama (Tragedy) 28 Sustainable development 27 Management 26 English fiction 24 Criticism 22 Environmental aspects 22 Plant cell 22 Fiction 21 Human ecology 21 Literature Malayalam 21