Environmental aspects Dissertations 53 Dissertations, Academic 52 Pollution 47 Heavy metals 40 Water 38 Purification 33 Refuse and refuse disposal 29 Analysis 24 Energy consumption 23 Management 23 Pesticides 23 Sewage 23 Environmental management 22 Industrial management 22 Waste disposal 22 Measurement 21 Production management 21 Air 18 Design and construction 17 Economic aspects 17 Renewable energy sources 16 Sustainable development 16 Environmental impact analysis 15 Health aspects 15 Palm oil industry 15 Safety measures 15 Biodiesel fuels 14 Carbon dioxide 14 Environmental auditing 14