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(Click for frequent words.) 88 carbon dioxide 85 carbon dioxide CO2 79 CO2 emissions 78 CO ² 78 carbon dioxide emissions 77 Co2 75 CO -2 74 carbon emissions 74 greenhouse gas 73 greenhouse gases 72 emissions 72 greenhouse gasses 71 CO2 emitted 71 C# emissions 71 co2 71 Carbon Dioxide 70 GHGs 70 carbon 70 CO2 emission 69 CO ₂ 69 carbon emission 69 carbon dioxide emission 69 carbon dioxide CO2 emissions 68 greenhouse gas emissions 67 GHG 66 GHG emissions 66 carbon dioxide emitted 66 carbon emitted 66 emission 65 NOx 65 greenhouse emissions 65 Co2 emissions 64 emmissions 64 Carbon dioxide 64 Emissions 63 CO -2 emissions 63 atmospheric CO2 63 Carbon dioxide CO2 63 CO ² emissions 63 atmospheric carbon dioxide 63 CO2e 63 N2O 62 greenhouse gas GHG emissions 62 particulate emissions 62 co2 emissions 62 CO2 emmissions 62 emmisions 62 potent greenhouse gas 62 greenhouse gases GHG 62 methane 61 carbondioxide 61 GHG emission 61 anthropogenic CO2 61 anthropogenic emissions 61 emission reductions 61 SO2 emissions 61 heat trapping carbon dioxide 60 greenhouses gases 60 NOX emissions 60 nitrous oxide emissions 60 emissons 60 sulphate aerosols 60 greenhouse gas emission 60 Greenhouse gasses 60 anthropogenic carbon dioxide 60 CO2 eq 60 SO2 60 GhG emissions 60 Global Warming Potential GWP 60 reduce carbon emissions 60 smog forming pollutants 59 greenhouse gases emitted 59 ozone depleting gases 59 greenhouse emission 59 NOx emissions 59 greenhouse gases GHGs 59 Carbon dioxide emissions 59 nitrogen oxide NOx emissions 59 CO2 concentrations 59 sequestering CO2 59 nitrous oxide N2O 59 sulfur dioxide 58 gases 58 emit CO2 58 reducing CO2 emissions 58 carbon dioxide CO2 emission 58 CO2e emissions 58 Carbon Dioxide CO2 58 reducing carbon emissions 58 gaseous emissions 58 nitrogen 58 gases emitted 58 CO2 equivalents 58 water vapor 58 greenhouse gas GHG 58 sequester CO2 58 carbon dioxides 57 atmospheric CO 57 pollutant emissions 57 carbon emmissions 57 emmission 57 absorbs carbon dioxide 57 Greenhouse gases 57 emission reduction 57 sulfur dioxide SO2 57 fossil fuel 56 #g CO2/km [001] 56 carbon dioxide CO ² 56 pollutants emitted 56 methane CH4 56 sulfate aerosols 56 sequestering carbon dioxide 56 CO2emissions 56 carbon dioxide concentrations 56 CO2 Emissions 56 CO2 emission reduction 56 #g/km CO2 [002] 56 pollutants 56 Carbon Emissions 55 nitrogen oxide 55 sequester carbon dioxide 55 CO 55 hydrogen 55 nitrogen oxide NOX 55 N2O emissions 55 carbon dioxide CO2 emitted 55 anthropogenic CO 55 ghg emissions 55 greenhouse gas emission reductions 55 harmful gasses 55 ozone O3 55 carbons 55 methane emitted 55 oxidized mercury 55 nitrogen oxides 55 gasses 55 particulate matter emissions 55 anthropogenic greenhouse gases 54 pollution 54 tailpipe pollutants 54 pollutant 54 Greenhouse Gas 54 carbon sequestered 54 polution 54 sulphate particles 54 nitrous oxides 54 VOCs 54 emit #g/km 54 emitting greenhouse gases 54 Sulfur Dioxide 54 sequesters carbon dioxide 54 carbon sinks 54 terrestrial biosphere 54 tailpipe CO2 emissions 54 CO2 emission reductions 54 hydrofluorocarbon HFC 54 Particulate Matter PM 54 tailpipe emissions 54 biosequestration 54 flue gases 54 atmospheric CO2 levels 54 CO2 sequestration 54 greenhouse gas GHG emission 54 SOx emissions 54 nitrogen oxides NOx emissions 54 greenhouse gasses emitted 53 emitting CO2 53 global warming gases 53 mercury emitted 53 biomass combustion 53 hydrofluorocarbons HFCs perfluorocarbons PFCs 53 refrigerant leakage 53 GHG reductions 53 CH4 53 sulfur dioxide emissions 53 fossil fuels 53 CO ₂ emissions 53 carbon dioxide equivalent CO2e 53 saline aquifer 53 carbon sequestration 53 nitrous oxide emission 53 nitrogen oxides emitted 53 reactive nitrogen 53 heat trapping gases 53 harmful tailpipe emissions 53 emitting fossil fuels 53 greenhouse gas nitrous oxide 53 Greenhouse Gas GHG emissions 53 ppmv 53 CO2/km 53 smog forming pollution 53 carbon capture 53 Carbon sequestration 53 sulfur dioxide SO2 emissions 53 nitrogen oxides NOx 53 GHG emission reductions 53 diesel particulate 52 Emission 52 dioxide emissions 52 nitrogen oxide emission 52 exhaust emissions 52 shredder residue 52 reduce NOx emissions 52 sequester carbon emissions 52 emit sulfur dioxide 52 atmospheric pollutants 52 atmospheric CO2 concentrations 52 HFC# 52 carbon emitting 52 soot particulates 52 renewably 52 megatonne 52 diesel particulates 52 nitrogen oxide emissions 52 emit GHGs 52 NF3 52 gigatonne 52 noxious gasses 52 nitrogen trifluoride 52 Atmospheric CO2 52 unburned hydrocarbons 52 atmospheric CO2 concentration 52 tailpipe gases 52 carbon footprint 52 GHG concentrations 52 gaseous pollutants 52 unmineable coal seams 52 carbon emission reductions 52 HFC refrigerants 52 GtC 52 produced Friedlingstein 52 biomass 52 fossile fuels 52 GHG emitted 52 hoofed critters 51 heat trapping pollutants 51 Carbon Offset 51 ozone depleting compounds 51 sulfate aerosol 51 VOC emissions 51 Carbon Monoxide CO 51 Nitrogen Oxide 51 emit greenhouse gases 51 polluting gases 51 sequester carbon 51 hydrofluorocarbons HFCs 51 ozone 51 ozone depleting substance 51 SO2 emission 51 House Gases GHGs 51 Nitrogen oxide emissions 51 smog forming emissions 51 CO2 CH4 51 NOx nitrogen oxide 51 isoprene 51 emit carbon dioxide 51 fluorocarbons 51 harmful gases 51 methyl chloroform 51 Nitrogen Oxide NOx 51 Greenhouse Gases 51 particulate pollutants 51 Carbon Dioxide CO2 emissions 51 refrigerant 51 GHG reduction 51 saline aquifers 51 warming gases 51 harmful particulates 51 carbon dioxide emission reductions 51 Methane 51 hydrofluorocarbon 51 carbondioxide emissions 51 mercury emissions 51 Co2 emission 51 underground geologic formations 50 hydrocarbons HC 50 tailpipe exhaust 50 NOx emission 50 absorbs CO2 50 manmade CO2 emissions 50 SO3 50 HCFC 50 ppm CO2 50 particulate matter emitted 50 Biomethane 50 greenhouse gas concentrations 50 cow farts 50 dioxide 50 global warming gasses 50 aerosol particles 50 fluorinated gases 50 emission offsets 50 Carbon dioxide emission 50 GHG emission reduction 50 R#a 50 ammonia NH3 50 hydrocarbons carbon monoxide 50 nitrous oxide NOx 50 biomethane 50 oVOCs 50 CO2 emitting 50 biogenic emissions 50 harmful pollutants 50 radiative forcing 50 geological sequestration 50 Gigatonnes 50 Tailpipe emissions 50 GhG 50 sulfur dioxide emission 50 sulfur dioxide pollution 50 deplete ozone 50 evaporative emissions 50 greenhouse gas emmissions 50 Nitrogen dioxide 49 nitrous oxide NOx emissions 49 chlorine peroxide 49 Volatile Organic Compounds 49 carbon dioxide nitrous oxide 49 bioethanol 49 tonnes CO2e 49 carbon credits 49 CO2 SO2 49 biofuel 49 emitting carbon dioxide 49 ozone depleting refrigerant 49 exhaust gasses 49 sequestered CO2 49 anthropogenic greenhouse gas 49 tropospheric ozone 49 global warming gases emitted 49 peat soils 49 biochar 49 tailpipe emission 49 emits #g/km [001] 49 Methane CH4 49 emitting #g/km 49 megatonnes 49 flue gas 49 gigatons 49 Carbon Emission 49 Sulphur dioxide 49 sulfur oxide SOx 49 saline formations 49 Sulfur Dioxide SO2 49 absorbing carbon dioxide 49 WtE 49 Carbon Dioxide CO 49 air pollution 49 cyclohexane 49 burning fossil fuels 49 nitrogen oxides carbon monoxide 49 sequestering carbon 49 combustion 49 sulfur dioxides 49 harmful byproducts 49 Volatile Organic Compounds VOC 49 gigatonnes 48 feebates 48 NO2 48 Sulphur Dioxide 48 Acid Rain Program 48 Nitrogen oxide 48 sulfuric acid mist 48 nitrification 48 Particulate emissions 48 #g CO2/km [002] 48 peat lands 48 SF6 48 atmospheric methane 48 GHGs emitted 48 exhaust gases 48 particulate matter 48 particulate matter PM 48 decarbonisation 48 GHG greenhouse gas 48 #ppm CO2 48 global warming 48 AdBlue 48 ppbv 48 anerobic 48 smog forming 48 algal biomass 48 SCR catalytic converter 48 Gas Emissions 48 oxidation catalyst 48 geo sequestration 48 Verified Emission Reductions 48 NOx SOx 48 sulfur oxide 48 excrete methane 48 heat trapping emissions 48 cow flatulence 48 Carbon 48 dimethyl sulphide 48 particulate soot 48 Emilie Moorhouse 48 particulate matter soot 48 HFO #yf 48 Mtoe 48 tpy CO2e 48 underground geological formations 48 ozone layer depletion 48 sulfur trioxide 48 carbon sequestering 48 Meri Pori 48 longwave radiation 48 atmospheric nitrogen 48 Earth biosphere 48 cow burps 48 particulate emission 48 tailpipes smokestacks 48 peatlands 48 Nitrogen Dioxide 48 methane burps 48 hydrocarbons 48 urea injection 48 stringent emission 48 Nitrogen Oxides 48 Nitrogen 48 C#F# [002] 48 SCR selective catalytic 47 HFC #a 47 smog forming nitrogen oxides 47 Biochar 47 Geologic Storage 47 sulfur dioxide SO2 nitrogen 47 emis sions 47 R #a refrigerant 47 nitrogen monoxide 47 #g/km CO2 [001] 47 carbon footprints 47 GHG emitters 47 demineralized water 47 harmful gases emitted 47 carbon offsets 47 sulfur 47 Sulfur compounds 47 Carbon Capture 47 SOx 47 bovine flatulence 47 biofuels 47 hydrogen H2 47 airborne pollutants 47 SOx NOx 47 gasifying coal 47 chlorofluorocarbons CFC 47 CARBON 47 smokestack scrubbers 47 Kharecha 47 smog forming gases 47 #.#g/km 47 DPFs 47 carbonyl sulfide 47 stratospheric ozone 47 smog forming compounds 47 GSHP systems 47 adipic acid 47 exhaust emission 47 nitric oxides 47 Nitrogen oxides 47 sulfur oxides SOx 47 marketable byproducts 47 manmade greenhouse gas 47 decarbonizing 47 sulfuric gases 47 harmless nitrogen 47 sulfur hexafluoride SF6 47 heat trapping carbon emissions 47 ozone depleting substances 47 mercury pollution 47 refrigerant gases 47 Selective Catalytic Reduction 47 Carbon Dioxide Emissions 47 Ozone Depleting 47 GHG abatement 47 EU ETS 47 Emissions Reduction 47 emits #g 47 particulate filters 47 nitrogen oxide NOx 47 Halons 47 oxyfuel 47 megatonne reduction 47 IGCC plants 47 Volatile Organic Compounds VOCs 47 anthropogenic CO2 emissions 47 ozone depletion 47 noxious pollutants 47 carbon emitters 47 #yf 47 Greenhouse Gas GHG 46 absorb carbon dioxide 46 nitrogen oxide pollution 46 aqueous urea solution 46 algae biomass 46 dinitrogen 46 gigaton 46 Ecofys 46 pollutant emission 46 RenDiesel fuel 46 Emission Reduction Units 46 Greenhouse Gas Emissions 46 petrodiesel 46 allowances EUAs 46 Carbon dioxide CO2 emissions 46 particulate matter nitrogen oxides 46 exothermic reaction 46 deep saline aquifers 46 thermal oxidizers 46 climate change 46 atmospheric moisture 46 Oxyfuel 46 particulate filter 46 enthalpy 46 ozone depleting chemicals 46 Laser Skin Resurfacing 46 carbonic acid 46 Hydrogen Sulphide 46 Greenhouse Gasses 46 EITE industries 46 Emission Reduction 46 C0 46 sequester carbon dioxide emissions 46 hydroxyl radical 46 noble gases 46 particulates 46 ethane propane butane 46 methane hydrate 46 invisible odorless tasteless 46 decarbonising 46 desorption 46 flue gasses 46 mercury sulfur dioxide 46 carbon dioxide sequestration 46 carbon dioxide methane 46 atmospheric CO2 enrichment 46 CARBON DIOXIDE 46 combustion gases 46 sulfur oxides 46 renewables 46 ozone depleting 46 climate forcings 46 carbon offsetting 46 heat trapping greenhouse gas 46 biogases 46 hydro carbons 46 amine scrubbing 46 tropical deforestation 46 CFCs chlorofluorocarbons 46 Greenland icesheet 46 sulfur diesel fuel 46 coalmine methane 46 VOC emission 46 Burning fossil fuels 46 sequestration CCS 46 methyl chloride 46 biogenic 46 iron sulphate 46 polluting 46 smog forming chemicals 46 NOx nitrogen oxides 46 hydrochlorofluorocarbon 45 CarbonTracker 45 oxidation catalysts 45 geosequestration 45 quadrillion BTUs 45 sulfate particles 45 CO2 Capture 45 toxic pollutants 45 trillion BTUs 45 HFCs perfluorocarbons PFCs 45 ozone layer 45 gaseous hydrogen 45 dissolved salts 45 EROEI 45 CarbonSMART ™ enterprise 45 emits #g/km [002] 45 inert nitrogen 45 Hydrogen 45 Nuclear fission 45 NExBTL diesel 45 hydroxyl radicals 45 greehouse gas 45 sulfur dioxide pollutant 45 hydrogen sulfide H2S 45 McElmo Dome 45 decarbonise 45 refrigerants 45 Bio SNG 45 oxyfuel combustion 45 cow belches 45 nitrogen NOx emissions 45 Carbon Credits 45 particulate matter sulfur dioxide 45 Anthropogenic 45 Particulate Matter 45 chlorofluorocarbon 45 geologic sequestration 45 electrochemical oxidation 45 ii Helium 45 nitrogen oxide burners 45 emits greenhouse gases 45 diesel particulate filter DPF 45 PM# particles 45 carbon monoxide particulate matter 45 methane hydrates 45 environmentally friendly refrigerants 45 Certified Emission Reduction CER 45 Atmosfair 45 upper troposphere 45 CFCs 45 sectoral crediting 45 springtime ozone 45 nitrous oxides NOx 45 Reference Scenario 45 VERs 45 Sulfur dioxide 45 hydrogen peroxide H#O# 45 Selective Catalytic Reduction SCR 45 greenhouse gas HFC 45 forcings 45 Greenhouse Gas Inventory 45 amine 45 H#O# 45 Certified Emission Reductions CER 45 Fossil fuels 45 fine particulates 45 methane CH4 nitrous oxide 45 glacial interglacial cycles 45 microbial decomposition 45 Powernext Carbon 45 elemental mercury 45 Amazonian forests 45 biogas 45 hydrogen sulphide H2S 45 kerogen 45 Climate 45 Ozone O3 45 R#a refrigerant 45 elemental sulfur 45 unburnt fuel 45 Evaporation 45 ammonia borane 45 Nitrogen Oxides NOx 45 sulfurous gases 45 respired 45 oxyhydrogen 45 emitted 45 anthropogenic 45 flyash 45 unburnt hydrocarbons 45 smokestack emissions 45 Hydrogen Sulfide H2S 44 quantified emission 44 biowaste 44 Storing carbon dioxide 44 conventional combustion engines 44 heat trapping greenhouse 44 tCO2e 44 volcanic aerosols 44 Greenhouse Friendly 44 oxide hydrofluorocarbons perfluorocarbons 44 fluorinated greenhouse gases 44 GOSAT 44 stomatal conductance 44 carbon monoxide CO 44 Pyrolysis 44 aerosol concentrations 44 Skyonic 44 Volatile Organic Compound VOC 44 thermal hydrolysis 44 climatic variability 44 sequester atmospheric 44 photosynthetically 44 anthropogenic climate 44 carbonate minerals 44 Certified Emission Reductions CERs 44 Sulfur dioxide pollution 44 volatile organic compounds 44 halogenated gases 44 anthropogenic warming 44 Activated Carbon 44 aerosols 44 HCFC #b 44 nitrogen NOx 44 Wiedinmyer 44 acid rain 44 decarbonization 44 #ppm [001] 44 denitrification 44 SO2 sulfur dioxide 44 perfluorocarbons PFCs 44 Emitters 44 Zeebe 44 Joint Implementation JI 44 condensing boilers 44 sub-#g/km CO2 44 Svante Arrhenius 44 VOC 44 trillionth tonne 44 permafrost melts 44 sulfur dioxide nitrous oxide 44 heat trapping gasses 44 Ozone depletion 44 sulfur dioxide SOx 44 evaporative 44 methane clathrates 44 thermal inertia 44 offgas 44 BIO TECHNOLOGY GROUP 44 heat trapping gases emitted 44 absorption chiller 44 carcinogens benzene 44 clathrates 44 carbon neutral 44 reduce SO2 emissions 44 emitters 44 Pollutant 44 atmospheric aerosols 44 Anaerobic digestion 44 selective catalytic 44 Stratospheric ozone 44 earths surface 44 singlet oxygen 44 emit greenhouse gasses 44 coal gasification 44 exajoules 44 gaseous methane 44 forest thinnings 44 C# [001] 44 smokestack pollutants 44 Carbonfund 44 albedo 44 iron fertilization 44 Biobutanol 44 sequester greenhouse gases 44 sulfur gases 44 soil carbon sequestration 44 Geoengineering 44 Nitrous Oxide 44 nitrogen dioxides 44 decomposing manure 44 fine particulate pollution 44 bicarbonate ions 44 pyrolysis oils 44 perfluorocarbons 44 liquification 44 Golf Bluemotion 44 solvation 44 CO2 emission allowances 44 finite fossil fuels 44 nonrenewable resources 44 nitrogen fertilizers 44 nitrogen oxides NO 44 Opcon Powerbox 44 cyanogen 44 efficiency condensing boiler 44 particulate pollution 44 polluter 44 Storage CCS 44 boreal ecosystems 44 nitrogen fixation 44 Ly alpha 44 greenhouse warming 44 CFC refrigerants 44 Greenhouse Gases GHG 44 reduces NOx emissions 44 TEEB 44 anaerobic lagoon 44 Ecologic Shine TM 44 biosphere 44 di oxide 44 photochemical reactions 44 ozone particulate matter 44 exhaled carbon dioxide 44 radiative 44 methane oxidation 44 Ammonia borane 44 terawatts 44 pollutions 44 stover 44 SO2 allowances 44 GHG pollution 44 ILUC 44 Sequestration 43 smog forming nitrogen oxide 43 demineralised water 43 Anaerobic Digestion 43 coal fired 43 BTUs 43 sulfuryl fluoride 43 conventional internal combustion 43 heat trapping greenhouse gases 43 BACT 43 harmful vapors 43 GHG emitting 43 Carbon Reduction Commitment CRC 43 Ecological Plastic 43 Global Warming 43 monoxide 43 GHG Emissions 43 gypsum byproduct 43 EGR engines 43 sooty particles 43 biocatalytic 43 mercury 43 oxide sulfur hexafluoride 43 soot particles 43 Stuart Haszeldine 43 usual BAU 43 Coal gasification 43 combustion engine 43 automobile tailpipes 43 particles emitted 43 biofuel blends 43 peatland 43 Carbon Sequestration 43 noncarbon 43 carbon dioxide methane nitrous 43 HCFCs 43 Particulates 43 Keeling Curve 43 Terrapass 43 Heart Laser RenalGuard 43 warmists 43 stabilizing atmospheric concentrations 43 chlorofluorocarbon CFC 43 RenDiesel ® 43 emit pollutants 43 CHAIRMAN CONNAUGHTON Well 43 digestors 43 degassed 43 stratospheric ozone depletion 43 chlorofluorocarbons 43 H2S 43 photolysis 43 Ecological Footprint 43 nonrenewable fuels 43 reduce greenhouse gasses 43 chilled ammonia 43 decarbonised 43 NOx trap 43 halon 43 diesel particulate emissions 43 RockTron 43 Southland lignite 43 exothermic 43 coal 43 conventional refrigerants 43 Emission Reductions 43 cap andtrade 43 Carbon Offsets 43 hydrological cycle 43 CO2 emitters 43 diesel particulate filter 43 bio fuels 43 cosmic ray flux 43 renewably generated 43 ocean acidity 43 silicic acid 43 NExBTL renewable diesel 43 poleward 43 nWNAB# 43 NH3 43 Emission Trading Scheme 43 Refrigerants Naturally 43 superoxides 43 interfacial tension 43 Lengai 43 nitrous oxide 43 halocarbons 43 Ozone depleting substances 43 pollutant particles 43 MACT standards 43 Particulate pollution 43 nitrification inhibitor 43 Biogas 43 nutrient runoff 43 Refrigerants 43 AAUs 43 sulfolane 43 Bluenext 43 lignite coals 43 SAP FI 43 sequesters carbon 43 Ozone depleting 43 refrigerant leaks 43 Flue Gas 43 HCCI combustion 43 nonrenewable fossil fuels 43 corn ethanol 43 syngas 43 negawatts 43 Le Quéré 43 diesel particulate filters 43 metal hydride 43 Palaeocene Eocene Thermal Maximum 43 vapor 43 verified emission reductions 43 Aerosols 43 biodiesel fuels 43 CO2 emitter 43 GHG emitter 43 Appy Sluijs 43 DBCCA 43 carbon dioxide emitter 43 emission allowances 43 fecal pellets 43 geoengineering schemes 43 reusing rainwater 43 chemically reactive 43 Schwarze Pumpe 43 anaerobic digestion AD 43 2oC 43 Fossil Fuel 43 NOX 43 #W light bulb 43 gigajoules 43 anthropogenically 43 sequestration 43 #.#mpg [001] 43 Ineos Bio 43 Tropical deforestation 43 Trichodesmium 43 poisonous gasses 43 Stefan Rahmstorf 43 Kyoto Protocol 43 nitrification inhibitors 43 cow enteric 43 nitrogen oxides NOX 43 Le Quere 43 gasified coal 43 Nitrogen NOx 43 cement kiln 43 EMISSIONS 43 GHG Protocol 43 emitting 43 dangerous anthropogenic interference 43 pollutant concentrations 43 renewable feedstocks 43 limonene oxide 43 glycol 43 methanol 43 catalytic oxidation 43 lithium hydroxide 42 extractable reserves 42 formate 42 Aker Clean 42 marine phytoplankton 42 NT Plasmatron 42 thermochemical processes 42 EOR 42 Haber Bosch process 42 trillion Btu 42 deep saline aquifer 42 odorous gases 42 ozone depleting chlorofluorocarbons 42 hydrochlorofluorocarbons 42 photosynthetic organisms 42 emit 42 sulfur fuels 42 carbonator 42 legally binding emission 42 hydrocarbon 42 troposphere 42 Hydrofluorocarbons 42 atmospheric concentrations 42 2C #.#F 42 Earth ozone layer 42 gigatonnes Gt 42 consultancy Ecofys 42 antihydrogen 42 NExBTL 42 seawater pH 42 nitrogen deposition 42 regenerable 42 IGCC 42 phytoplankton biomass 42 oil equivalent Mtoe 42 peroxynitrite 42 combustion byproducts 42 Polycyclic aromatic hydrocarbons 42 Carbon dioxide emitted 42 gas milage 42 octene 42 particulate contaminants 42 Nalco Mobotec 42 Kyoto Protocal 42 Hydrogen Sulfide 42 recyclate 42 NOAA ESRL 42 DeNOx 42 Canadell 42 Malte Meinshausen 42 anaerobic decomposition 42 carbon emission allowances 42 ocean fertilization 42 2ppm 42 oceanic circulation