Related by context. Frequent words. (Click for all words.) 54 Melting glaciers 53 temperature inversions 51 atmospheric pollutants 51 pollutions 51 heavily polluted 50 choking haze 50 sulfur dioxide nitrogen oxides 50 salination 49 airborne pollutants 49 greenhouse gases GHGs 48 Nitrogen oxides 48 rotting vegetation 48 Sulfur dioxide 48 Heavy snowfalls 48 suffocating smog 47 pollutants 47 choking smog 47 pollution 47 Particulates 47 peat fires 47 Soil erosion 47 atmospheric ozone 47 acid rain 46 rivers 46 phytoplankton blooms 46 lahars 46 Taihu Lake 46 pollutants emitted 46 Algae blooms 46 absorbs carbon dioxide 46 Thick clouds 46 air pollution 46 aerosol particles 46 ashfall 46 creeks streams 45 drier summers 45 POLLUTION 45 upper troposphere 45 Northerly winds 45 soot particles 45 spewed ash 45 rivers lakes 45 smog 45 gyres 45 Warming temperatures 45 glacial melting 45 peat bogs 45 deplete oxygen 45 toxic algae blooms 45 Rapid urbanization 44 ozone concentrations 44 sulfur dioxide SO2 44 pollutant 44 airborne particulates 44 Volcanic eruptions 44 ozone smog 44 rapid snowmelt 44 sulfur dioxide nitrogen oxide 44 spewing volcano 44 sulphates 44 greenhouse gases GHG 44 atmospheric methane 44 bird migrations 44 Invasive plants 44 terrestrial ecosystems 44 intermittent streams 44 parched landscape 43 ultra violet radiation 43 Iceland Eyjafjoell volcano 43 volcanic peaks 43 particulates 43 fine particulates 43 Melting snow 43 nitrogen dioxide NO2 43 temperate rainforest 43 forests 43 Greenhouse gases 43 gully erosion 43 potent greenhouse gas 43 biodiversity hotspot 43 hazy skies 43 lowland forests 43 toxic pollutant 43 polluted 43 aquatic ecosystems 43 haze 43 particles emitted 43 Diesel exhaust 43 temperature inversion 43 marine sediments 43 glacier melt 43 Three Gorges Reservoir 43 fine particulate 43 plankton blooms 42 vulcanologists 42 Burning fossil fuels 42 Pollutants 42 Saharan dust 42 rampant deforestation 42 thawing permafrost 42 volcanic ash drifting