Related by context. Frequent words. (Click for all words.) 57 greenhouse gases 55 greenhouse gas emissions 55 greenhouse emissions 55 greenhouse gas 54 emissions 54 greenhouse gas emission 54 greenhouse gasses 54 carbon emissions 53 carbon dioxide emissions 53 carbon dioxide CO2 52 carbon dioxide 52 carbon emission 52 CO2 emission 51 CO2 51 emission reduction 51 CO2 emissions 50 emission reductions 49 emission 49 heat trapping gases 49 carbon dioxide CO2 emissions 49 reducing carbon emissions 48 reduce carbon emissions 48 global warming gases 48 carbon 47 emitters 46 GHG emissions 45 pollutants 45 polluters 45 pollution 45 pollutant 45 nitrogen oxide 45 Kyoto treaty 44 GHG 43 gases 43 air pollution 42 nitrogen oxides 42 NOx 42 Kyoto Protocol 42 climate change 42 Kyoto accord 42 gases blamed 42 Kyoto protocol 42 exhaust emissions 41 particulate matter 41 sulfur dioxide 41 reduce greenhouse gas 41 tailpipe emissions 41 reducing greenhouse gas 41 mercury emissions 41 CERs 41 biofuels 40 fossil fuel 40 nitrogen oxide emissions 40 Kyoto pact 40 Emissions 40 carbon credits 40 sulfur dioxide emissions 40 carbon capture 40 global warming 40 particulates 39 Copenhagen Accord 39 polluter 39 hydrogen 39 nitrogen 39 mercury pollution 39 biomass 39 Montreal Protocol 39 methane 39 bio fuels 39 volatile organic compounds 38 gasses 38 burning fossil fuels 38 liquid fuels 38 fossil fuels 38 Environmental Protection Agency 38 renewables 38 biofuel 38 EPA 38 UNFCCC 37 carbon sequestration 37 polluting 37 Clean Development Mechanism 37 methyl bromide 37 flue gas 37 emitter 37 CDM 37 bioethanol 37 poorer nations 37 hazardous wastes 37 water vapor 37 EU ETS 36 soot 36 Environment Programme 36 renewable energy 36 zero emission 36 legally binding treaty 36 nitrogen dioxide 36 renewable energies 36 Environment Programme UNEP 36 biogas 35 toxic chemicals