Environmental aspects Dissertations 174 Dissertations, Academic 169 Pollution 68 Heavy metals 53 Water 51 Pesticides 41 Environmental impact analysis 38 Management 37 Purification 35 Refuse and refuse disposal 31 Environmental management 29 Analysis 26 Economic aspects 25 Industrial management 25 Sewage 25 Measurement 24 Sustainable development 24 Energy consumption 23 Waste disposal 23 Air 22 Production management 22 Design and construction 19 Industries 19 Water quality 18 Land use 17 Palm oil industry 17 Safety measures 17 City planning 16 Health aspects 16