Related by context. Frequent words. (Click for all words.) 83 mercury emissions 67 pollution 64 greenhouse gases 63 pollutants 63 air pollution 61 emissions 61 mercury 61 greenhouse gas emissions 60 carbon dioxide emissions 59 greenhouse emissions 58 pollutant 57 greenhouse gas 57 EPA 56 carbon emissions 55 Environmental Protection Agency 54 carbon dioxide 54 emission 54 toxic chemicals 53 sulfur dioxide 52 Pollution 52 GHG emissions 51 CO2 emissions 50 Emissions 50 acid rain 50 coal fired 50 polluters 49 global warming 49 emission reduction 49 carbon emission 48 polluting 48 PCBs 48 reduce carbon emissions 47 secondhand smoke 47 coal ash 47 CO2 47 Clean Air 46 arsenic 45 toxins 45 phthalates 45 BPA 45 contaminant 45 contaminants 44 radon 44 burning fossil fuels 44 ozone 44 polluted 44 cadmium 44 climate change 44 pollute 44 carcinogens 44 overfishing 43 particulate matter 43 Clean Water Act 43 smog 43 soot 42 chromium 42 toxic substances 42 carcinogen 42 fossil fuels 42 fluoride 42 pesticides 41 Asian carp 41 NRDC 41 hazardous chemicals 41 DEQ 40 perchlorate 40 pesticide 40 fossil fuel 40 fracking 40 Water Quality 40 groundwater 40 carbon 40 dioxin 40 toxic waste 40 methane 39 deforestation 39 environmentalists 39 toxicity 39 toxin 39 MTBE 39 benzene 39 phosphorus 39 Sierra Club 39 phosphorous 39 environmental 39 selenium 39 toxic 39 coal 39 contamination 39 invasive species 39 sediment 39 manganese 39 landfills 38 emitters 38 EPA Administrator 38 renewable energy 38 Wildlife Federation 38 Environmental Quality 38 DEP 38 hazardous waste 37 watersheds