Related by context. All words. (Click for frequent words.) 64 gigaton 63 megatonnes 63 CO2e emissions 63 CO2 eq 61 tonnes CO2e 61 gigatonne 60 kilotonnes 60 5mn tonnes 59 megatons 58 carbon dioxide equivalent CO2e 58 megatonne reduction 57 CO ₂ 57 carbon dioxide CO2 emission 57 #GWh [003] 57 emitting fossil fuels 57 kilotonne 56 Au eqv 56 tCO2e 56 CO2 equivalents 56 CO -2 emissions 56 5mt 56 #PJ [001] 56 emissons 55 extractable reserves 55 biosequestration 55 cubic meters m3 55 exajoules 55 Hiroshima atomic bombs 55 gigajoules 55 carbon dioxide CO2 emitted 55 emit GHGs 55 carbondioxide emissions 55 greenhouse gas emmissions 55 #-#,# tonnes [002] 55 #-#,# tonnes [001] 55 produced Friedlingstein 54 carbon sequestered 54 Co2 emissions 54 carbondioxide 54 ppbv 54 Mtoe 54 oil equivalent Mtoe 54 levelised cost 54 megajoules 54 HFC# 54 megajoule 54 particulate matter emitted 53 stabilizing atmospheric concentrations 53 geo sequestration 53 ounces Moz. 53 sulphate aerosols 53 greehouse gas 53 tonnes 53 per annum Mtpa 53 renewably 53 #MWh 53 nitrous oxide N2O 53 #g/km CO2 [002] 53 greenhouse gas emission reductions 53 GHG emitted 53 per annum MMTPA 53 mtoe 52 CO2 emission reductions 52 giga watts 52 nitrogen oxides NOx emissions 52 giga watt 52 CO2 52 anthropogenic CO 52 gigatons 52 CO2 emitted 52 GHG abatement 52 methane emitted 52 tU 52 Carbon dioxide CO2 52 smog forming pollutants 52 tonne 52 5Mtpa 52 GHG reductions 52 sulfur dioxide SO2 nitrogen 52 Greenhouse gasses 52 per annum mmtpa 52 #,#-#,# tonnes [002] 52 #g CO2/km [001] 52 carbon dioxide emission 52 Kyoto Protocol obliges 52 Devon Jackfish 51 megaton nuclear 51 co2 emissions 51 petajoule 51 GHG emission reductions 51 Kearl oilsands 51 CO -2 51 #mtpa [002] 51 carbon emitted 51 greenhouse gases GHGs 51 potent greenhouse gas 51 CO2 emmissions 51 nitrous oxide NOx 51 SOx emissions 51 CarbonSMART ™ enterprise 51 adipic acid 51 global warming gasses 51 trillion Btu 51 emit #g/km 51 gigawatt GW 51 MTOE 51 Suncor oilsands 51 nitrogen oxide NOX 51 #mln tons [002] 51 CO ² emissions 51 co2 51 emits #g 51 Gigawatts GW 51 Alberta tarsands 51 carbon emmissions 51 trillion BTUs 51 nitrous oxides NOx 51 CO ² 51 underground geological formations 51 emits #g/km [001] 51 nitrous oxide emission 51 Sm3 51 CO2 emission reduction 51 #GWh [002] 51 kWhr 51 gigatonnes 51 oilsands extraction 51 carbon dioxide emission reductions 51 Weipa bauxite 50 mil mt 50 CO ₂ emissions 50 gigatonnes Gt 50 bluefin tuna quota 50 dioxide emissions 50 trillionth tonne 50 #ktpa 50 terrawatt hours 50 CBEH bio diesel 50 economically extractable 50 terawatt hour 50 #,#-#,# oz 50 terawatts 50 Nitrogen oxide emissions 50 greenhouse emissions 50 5Mt 50 Lignite coal 50 sulfur dioxide pollution 50 Endako mine 50 #.#TWh [002] 50 saline aquifer 50 sequester CO2 50 cow enteric 50 sulphate particles 50 Carbon Dioxide CO2 emissions 50 Melkøya 50 CO2 emissions 50 tpd throughput 50 carbon dioxide emissions 50 2mn tonnes 50 greenhouse gasses emitted 50 emit greenhouse gasses 50 sulfur dioxide SO2 emissions 50 emmisions 50 #Mt y 50 greenhouse emission 50 tailpipe pollutants 50 Particulate emissions 50 micro sieverts 50 ppmv 50 endorses halving 50 #Mt [002] 50 Terawatt hours 50 emit sulfur dioxide 50 Emission Reduction Units 49 Glacial melt 49 3Mtpa 49 Nm3 h 49 mpta 49 Gigatonnes 49 usual BAU 49 ITER reactor 49 renewably generated 49 #mcm 49 nuclear fission reactors 49 GHG emission reduction 49 metric tons MMT 49 gypsum byproduct 49 liquids CTL plant 49 nitrogen oxides emitted 49 1Mtpa 49 carbon emissions 49 teragrams 49 #.#Mt [001] 49 8GW 49 #mn tonnes 49 emmission 49 sequestering CO2 49 gigalitre 49 concentrator throughput 49 tonns 49 sulfur dioxide emission 49 kiloton explosion 49 Integrated Carbon Capture 49 emit CO2 49 1mt 49 #.#t [003] 49 Tiwai Point 49 biomass combustion 49 carbon emission reductions 49 subbituminous coal 49 nonrenewable fossil fuels 49 Sulfur dioxide pollution 49 depleting fossil 49 metric tons 49 Verified Emission Reductions 49 decarbonised 49 british thermal 49 #TWh [002] 49 Coarse grain 49 terajoules 49 #MW [001] 49 #Mt [001] 49 Recoverable reserves 49 GHG concentrations 49 nitrogen oxide NOx emissions 49 baseload renewable 49 carbon dioxide 49 cathode copper 49 greenfield aluminum smelter 49 mercury emitted 49 GHG emission 49 MWt 49 carbon dioxide CO2 49 3m b d 49 GWe 48 Nitrogen oxide 48 tpy ethylene 48 produce #,#-#,# ounces 48 pollutant emission 48 di oxide 48 manganese ferroalloys 48 oilsand 48 CO2emissions 48 #,#-#,# b d [001] 48 estimated #TWh [002] 48 deplete ozone 48 1Mt 48 cu meters 48 average megawatts aMW 48 kiloton atomic bomb 48 trillion Btus 48 magnetite concentrate 48 carbon dioxide emitted 48 #mn tpa 48 SO2 emission 48 2mt 48 apatite concentrate 48 GHG reduction 48 GHGs emitted 48 trln cubic meters 48 Nitrogen Oxide NOx 48 1mn tonnes 48 #MWe [002] 48 Carbon dioxide CO2 emissions 48 Kim Carstensen WWF 48 Carbon Dioxide CO2 48 #Mtpa [002] 48 bcf d 48 kw hr 48 enriched uranium HEU 48 greenhouse gases GHG 48 NExBTL diesel 48 pgms 48 Wheatstone LNG 48 kilocalorie 48 pounds U#O# 48 pollen particles 48 Million Metric Tonnes 48 greenhouse gas emissions 48 nitrous oxide NOx emissions 48 tonnes mt 48 coalfired power 48 CO2e carbon dioxide 48 #mtpa [001] 48 #.#MT [002] 48 nitrogen oxides sulfur oxides 48 C# emissions 48 #.#mt y [002] 48 hydrofluorocarbon 48 Meri Pori 48 tailpipe gases 48 nitrate fertilizer 48 greenhouse gas GHG emission 48 metric tonne MT 48 #.#Mt y 48 carbon dioxide CO ² 48 fossil fuel 48 #mil tonnes 48 harmful gasses 48 carbon dioxide concentrations 48 #GWh [001] 48 tpy naphtha cracker 48 smog forming compounds 48 baseload electricity 48 6GW 48 Scotford upgrader 48 Tunguska Siberia 48 hectoliter 48 polygeneration 48 Certified Emission Reductions CER 48 anthropogenic carbon dioxide 47 Kitimat smelter 47 demineralized water 47 gigawatt hours 47 metric tonne mt 47 GHGs 47 picocurie 47 Dr Raupach 47 cu ma 47 cubic meters 47 Tapuli Stora Sahavaara 47 Kharecha 47 1m b d 47 Tar sands 47 Lengai 47 tpa nickel 47 hectopascals 47 ethane extraction 47 MMt 47 W/cm2 47 Kamandanu 47 CO2e 47 CO2/km 47 petajoules PJ 47 cocaine Valencia Arbalaez 47 ppm CO2 47 GW gigawatts 47 Carbon dioxide emissions 47 ghg emissions 47 MWth 47 tonne alumina refinery 47 Mt CO2e 47 emis sions 47 Grundartangi Iceland 47 sequester carbon dioxide 47 #oz [001] 47 raw bitumen 47 gasifying coal 47 Verified Emission Reductions VERs 47 Mwh 47 2Mtpa 47 tailpipe CO2 emissions 47 CO2 emission 47 bln cu m 47 nitrogen oxide emission 47 Waupisoo pipeline 47 #.#m tonnes [002] 47 MTPY 47 kWH 47 selembu bull 47 ozone particulate matter 47 Cow burps 47 bitumen extraction 47 cap andtrade 47 enriched uranium hexafluoride 47 sequesters carbon dioxide 47 Sm3 oe 47 liquefying coal 47 kL 47 Chilled pork 47 containing soot dioxins 47 GhG emissions 47 smog forming chemicals 47 Iceland volcanos Eyjafjalljokull 47 Global Warming Potential GWP 47 2Mt 47 tonne mt 47 bitumen upgrader 47 Canada ecoTrust 47 PJe 47 carbon 47 greenhouse gases 47 Eider Rock 47 emissions 47 kWe 47 methane CH4 47 cubic feet mcf 47 kilotons comparable 47 AEO# reference case 47 LV PCI 47 IEO# reference case 47 CO2 SO2 47 Changqing oilfield 47 Inferred Resource grading 47 Maintain Outperform rating 47 undiscounted NPV 47 Belle Plaine Saskatchewan 47 reduce NOx emissions 47 greenhouse gas GHG emissions 47 hydrofluorocarbon HFC 47 #.#Mtpa 47 mercury sulfur dioxide 47 bequerels 47 Mb d 47 anthropogenic CO2 47 #ppm CO2 47 forest thinnings 47 terrestrial biosphere 47 hole FC# 47 bn cu.m. 47 nitrogen oxides carbon monoxide 47 global warming gases emitted 47 carbon dioxides 47 carbon dioxide emmissions 47 pelletisation plant 47 #Moz 47 Mtpa 47 sulfuric dioxide 47 #.#Mt [004] 46 smog soot 46 #mmcf 46 soil carbon sequestration 46 carbon emission 46 kilowatthours 46 #mt [002] 46 polluting gases 46 Million Tonnes 46 2oC 46 lithium hydroxide 46 underground coal seams 46 Powernext Carbon 46 geological sequestration 46 Adequate ventilation 46 GSHP systems 46 gigajoule 46 bo d 46 #.#mt [005] 46 quadrillion BTUs 46 Kearl oilsands mine 46 tpy CO2e 46 #Mw [001] 46 tailpipes smokestacks 46 reduces NOx emissions 46 Conawapa 46 mWh 46 Alcan Kemano 46 twh 46 re gassified LNG 46 kwhs 46 megwatts 46 mtpd 46 #mln tons [001] 46 springtime ozone 46 kiloliters kl 46 cyclohexane 46 Pilesgrove solar 46 #mn bpd 46 Southland lignite 46 MMcm 46 Packaging Directive 46 #.#Mlb [002] 46 microbial decomposition 46 photic zone 46 MMcm d 46 EITE industries 46 zinc conc 46 lithium carbonate equivalent 46 4E ounces 46 biogases 46 greenhouse gasses 46 decarbonisation 46 earths surface 46 Tailpipe emissions 46 bagasse cogeneration 46 mineable coal 46 Sulphuric acid 46 unburned hydrocarbons carbon monoxide 46 de carbonization 46 SO2 emissions 46 nitrous oxides 46 Anticipated throughput 46 terabecquerel equals trillion 46 m3/hr 46 Bish Cove 46 degrees Celsius #.#F [001] 46 airborne pollutant 46 quadrillion BTU 46 MegaWatts 46 #.#mn tpa [001] 46 #GW [002] 46 #/MWh [002] 46 GHG emissions 46 quadrillion Btu 46 WyGen III 46 carbon dioxide nitrous oxide 46 #.#mil tonnes 46 nitrogen oxide burners 46 legally binding pact obligating 46 #,#-#,# cubic meters 46 Tropical deforestation 46 #,#,# cu ft 46 Chapudi 46 sequestering carbon dioxide 46 hydrofluorocarbons HFCs 46 Jansen potash project 46 NOX emissions 46 Bq/m3 46 lorry journeys 46 metric tons mt 46 2ppm 46 saline aquifers 46 emitting #g/km 46 per gigajoule 46 Bio SNG 46 mtpy 46 deep saline aquifer 46 USD #/tonne 46 Byproduct revenues 46 KWh 46 5GW 46 Sulphur dioxide 46 raw yellowcake uranium 46 PlascoEnergy 46 aluminum smelting capacity 46 smog forming gases 46 diameter rotors 46 cubic meter 46 oxidized mercury 46 drillhole spacing 46 Keephills 46 #,#,# bpd 46 hydrocarbons carbon monoxide 46 mallee trees 46 copper anodes 46 Wm -2 46 degrees above preindustrial 46 Mongstad 46 forestry residues 46 Coleson Cove 46 greenhouse gas 46 #mt [001] 46 invisible odorless tasteless 46 emission offsets 46 megawatt geothermal 46 Nuclear fission 46 BZE 45 oilsands upgrader 45 Jackpine Mine 45 #.#mpg [001] 45 Joint Implementation JI 45 Co2 emission 45 bln kwh 45 metric tonnes 45 tonnage milled 45 #mmcf d 45 RenDiesel fuel 45 #,#,# MT 45 preindustrial levels 45 respired 45 #g CO2/km [002] 45 Sugarcane ethanol 45 sequestration CCS 45 heat trapping gases emitted 45 refinable 45 oz y 45 #.#Mlbs U#O# [001] 45 bln cubic meters 45 nitrogen oxides particulate matter 45 cubic meters bcm 45 Muskeg River Mine 45 mrem 45 4mn tonnes 45 copper bauxite kaolin 45 potassium sulfate 45 #,#-#,# boe d [002] 45 #,#,# mw 45 Rls.# [002] 45 #TWh [001] 45 heat trapping pollutants 45 #,#,# metric tonne 45 #,#,# MW 45 Wintering Hills project 45 Wintering Hills wind 45 per annum MTPA 45 Geologic Storage 45 KwH 45 ozone O3 45 breathable dust 45 particulate emissions 45 cementitious materials 45 insitu 45 ounces 4E 45 Trekkopje mine 45 metric tons mmt 45 M lbs U#O# 45 g CO2/km 45 de carbonizing 45 Sulfur dioxide emissions 45 megawatt mw 45 1GW 45 NExBTL renewable diesel 45 Greenhouse Gas Inventory 45 reduce greenhouse gas 45 National Pollutant Release 45 5mtpa 45 hectoliters hl 45 nitrogen dioxides 45 R7 ,6 45 ounces AuEq 45 particulate pollutants 45 millisieverts mSv 45 ferro niobium 45 kilotonnes kt 45 Kcal kg 45 #.#-#.# degrees Fahrenheit [002] 45 allowances EUAs 45 Keeps EUR# 45 Bogoso sulfide processing 45 hoofed critters 45 Upper Mattagami 45 Metric Ton 45 microscopic airborne particles 45 Inkai 45 Trucks hauled 45 1mn tpa 45 uranium ores 45 MW ultra supercritical 45 Lower Mattagami 45 reduce carbon emissions 45 mmtpa 45 deadweight tonnage 45 desal plants 45 reducing carbon emissions 45 Liquified natural 45 Whitelee wind farm 45 Kitimat liquefied natural 45 kwH 45 cubic feet BCF 45 cubit feet 45 anthropogenic emissions 45 #,#-#,# b d [002] 45 Reducing carbon emissions 45 Co2 45 New Johnsonville Tenn. 45 ozone precursors 45 trinitrotoluene 45 killowatt hour 45 greenhouse gas HFC 45 Klockner Stadium roared 45 mtpa steel 45 ferrochromium 45 ASHRAE #.#-# 45 mbtu 45 feedstock ethane 45 mega watt MW 45 atmospheric CO2 levels 45 nitrous oxide emissions 45 manmade greenhouse gas 45 hydrazine hazardous 45 per annum tpa 45 Hormozgan Steel 45 Certified Emission Reductions 45 sulfur oxides SOx 45 #.#mln tons [005] 45 Carbon dioxide emission 45 Reference Scenario 45 longwave radiation 45 melt glaciers 45 SPF lumber 45 MMBD 45 terrawatt hours TWh 45 megapascals 45 cf d 45 reduce greenhouse gasses 45 #,#-#,# mt [003] 45 Technetium 45 7MW 45 SO2 sulfur dioxide 45 gassification 45 Marillana project 45 Kyoto obliges 45 RGGI allowances 45 Lithium Potash Brine 45 lowest levelized 45 Tongchuan City 45 metric ton MT 45 #.#Mt [002] 45 Particulate Matter PM 45 Mtpy 45 pelletization 45 #.#Mlb [001] 45 particulate matter nitrogen oxides 45 NEDC combined 45 Scotford Upgrader 45 pelletizing plant 45 kiloton 45 carbon monoxide nitrogen oxide 45 Shell Albian Sands 45 icesheets 45 Gwh 44 Bolivia nationalizes 44 Riversdale Benga 44 Weyburn Midale 44 xenon propellant 44 #ppm U 44 exothermic reaction 44 Marlo Raynolds executive 44 oz.Au 44 terawatt 44 combustion byproducts 44 BrightSource Ivanpah 44 gha 44 cyclic carbonates 44 cubic meters mcm 44 Clare Demerse 44 RenDiesel ® 44 #.#mtpa 44 Tunlan coal mine 44 Chapada mine 44 #MW #MW [001] 44 hydro electric generators 44 emission reductions 44 Cobbora 44 #bcf [001] 44 Sainte Sophie 44 WtE 44 Boundary Dam 44 #.#/kWh [001] 44 ozone depleting refrigerant 44 #,#-#,# ounces 44 MRET 44 particulate emission 44 sulfur dioxide emissions 44 anthropogenic greenhouse gas 44 NEDC cycle 44 megawatts MWs 44 kT 44 #.#/ton [003] 44 #,#,# metric tonnes [002] 44 sequester greenhouse gas 44 Minesite costs 44 feebates 44 bitumen upgrading 44 ilmenite ore 44 gaseous pollutants 44 Alberta tar sands 44 magnetite ore 44 eU#O# 44 GtC 44 Tuticorin smelter 44 dirtiest fossil 44 absorbs carbon dioxide 44 MoveOntario 44 bcm y 44 cyanogen poisonous gas 44 cubic feet scf 44 Storing carbon dioxide 44 #.#mn tpa [002] 44 radioactive tailings 44 kilotons 44 #Mw [003] 44 surge inland Suhayda 44 bln kWh 44 joules 44 #bopd 44 HBCs weigh 44 VND1 ,# 44 shortline railways 44 degrees Centigrade #.#F 44 Springerville Generating Station 44 ZeroGen 44 heaviest polluters 44 S.Africa maize deliveries 44 leased NGL 44 kWh kilowatt 44 Peculiar Knob 44 quantified emission 44 smog forming 44 heat trapping carbon dioxide 44 kilowatts KW 44 sulfur dioxide SOx 44 turbo compressor 44 Gigajoule 44 verified emission reductions 44 Codelco copper 44 petajoules 44 #ppm [002] 44 El Quimbo 44 monocrystalline cells 44 GHG emitters 44 liquefication 44 gigawatts GW 44 unrecycled 44 Schels expects 44 GGAS 44 Chevron Gorgon LNG 44 metric tonne 44 Refined zinc 44 Mcm d 44 #.#GW [003] 44 leave NoWaste TM 44 Saskatchewan potash 44 #.#TWh [001] 44 particulate matter PM# 44 #.#mn tpa [003] 44 desalinate sea 44 soot particulates 44 Lester Lave professor 44 metric tonnes MMT 44 #.#mbpd 44 Carryover stocks 44 particulate matter soot 44 kJ 44 Athabasca tar sands 44 N2O emissions 44 Bontang LNG 44 unobtanium worth 44 #.#mln ton [001] 44 Jharsuguda aluminum smelter 44 tons 44 Megawatts MW 44 1/gallon 44 GOSAT 44 platinum palladium rhodium 44 halogenated gases 44 Assigned Amount Units AAUs 44 ILZSG 44 aMW 44 mega watts MW 44 Gold Equivalent Ounces 44 sulfur oxides nitrogen oxides 44 Kcal 44 situ bitumen 44 sequester atmospheric 44 Shell Muskeg River 44 rudimentary atomic bombs 44 #,#-#,# tonne [001] 44 respirable 44 Dr Diesendorf 44 Bcm 44 g t grammes 44 elec tricity 44 #ML [002] 44 Constancia Zone 44 emmissions 44 #.#mln ton [002] 44 budgetary surpluses 44 GWp 44 kw h 44 Certified Emission Reductions CERs 44 greenhouses gases 44 airmail tonnage 44 smog forming pollution 44 bn cu m 44 7GW 44 arable soils 44 cetane rating 44 kraft pulp mills 44 Longannet coal 44 ORI AU 44 tantalum pentoxide 44 liquefaction plant 44 Million Metric Tons 44 BAU scenario 44 greenhouse gas emitting 44 Hydroelectric Power Generation 44 minerals ores 44 boron trifluoride 44 onshore wind turbines 44 liquid NGL fractionation 44 trln cubic feet 44 gasify coal 44 Ag Eq Oz 44 biomass biogas 44 Vestas V# wind turbines 44 mT 44 #.#kWh 44 biomass cogeneration 44 gW 44 #.#GW [002] 44 estimated #TWh [001] 44 2C #.#F 44 cubic ft 44 reducting 44 tph 44 biocapacity 44 Methane CH4 44 scene Santostefano 44 DOE SunShot Initiative 44 bl d 44 Longannet 44 lignite coals 44 Emission Trading System 44 #twh 44 #.#mn bpd [001] 44 trillion cubic meters tcm 44 pelletising plant 44 Greenhouse Gas GHG emissions 44 #mln ton 44 cow burps 44 Niobec mine 44 cellulose ethanol 43 2m b d 43 CLIMATE SPECTATOR 43 CO2 emitter 43 Siemens SWT 43 Industrialised nations 43 Spinifex Ridge 43 ozpa 43 sulfur dioxide pollutant 43 ft3 43 Hiroshimas 43 #koz [002] 43 #,# ozpa 43 Nitrogen fertilizer 43 4per cent 43 NZUs 43 Coking coal 43 8MW 43 tungsten WO3 43 +#,# ounces 43 Joslyn oilsands 43 #.#C #.#C 43 #-#,# ounces 43 KZT# 43 #.#/tonne [003] 43 mcm d 43 greenhouse emitters 43 extractable coal 43 petajoules equivalent PJe 43 seaborne thermal 43 millisievert 43 bovine flatulence 43 3GW 43 CO2 sequestration 43 regassified 43 ethane methane 43 clinker cement 43 mildly radioactive 43 sulfur dioxide SO2 43 m³ d 43 Ankershoffen declined 43 meticais liter 43 prolific Abitibi region 43 #.#mn tons [002] 43 hematite ore 43 pollutants emitted 43 Raglan nickel 43 tpy 43 Barrancabermeja refinery 43 Adipic acid 43 diesel particulates 43 end Ixtoc spewed 43 spokeswoman Christine Milne 43 Fujian Sichuan Hebei 43 Karara iron ore 43 Neste Oil Porvoo refinery 43 Airfreight throughput 43 SOx NOx 43 fluorite powder 43 Jharsuguda smelter 43 particulate soot 43 argentinian debt crisis 43 #bn cubic meters 43 megwatt 43 urea ammonia 43 #/kW 43 #.#-#.# mln [003] 43 Soumber deposit 43 carbon dioxide CO2 emissions 43 Huckleberry Mine 43 de carbonise 43 #mn tpy 43 NIOB interval n 43 coal anthracite bituminous 43 separative work 43 Million Tons 43 Shell Scotford 43 cubic feet equivalent bcfe 43 mmscm 43 hydrofluorocarbons HFCs perfluorocarbons PFCs 43 mw captive 43 Caustic soda 43 #ML [001] 43 Nitrogen Oxides 43 Keephills 3 43 oz pa 43 #-# GWe 43 mature lodgepole pines 43 MARRIOTT REVENUES totaled 43 Roy Krzywosinski 43 Mount Everests stacked 43 NRE Wongawilli Colliery 43 #,#-#,# boepd 43 mcfpd 43 3mn tonnes 43 sulfur dioxide nitrogen dioxide 43 Athabasca oilsands project 43 emission reduction