Plasma (Ionized gases) 22 Environmental aspects 16 Gases 16 Greenhouse gases 15 Absorption and adsorption 7 Measurement 6 Purification 6 Carbon dioxide 5 Dense plasma focus 5 Separation 5 Electric discharges through gases 4 Analysis 3 Climatic changes 3 Dissertations 3 Dissertations, Academic 3 Gases, Rare 3 Greenhouse gas mitigation 3 Landfill gases 3 Membranes (Technology) 3 Renewable energy sources 3 Carbon dioxide mitigation 2 Chemical reactions 2 Combustion 2 Combustion gases 2 Computer simulation 2 Diffusion 2 Dusty plasmas 2 Electron beams 2 Gas lasers 2 Gas separation membranes 2