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(Click for frequent words.) 62 decarbonisation 59 decarbonised 57 de carbonizing 57 GHG abatement 57 de carbonisation 56 GHG reductions 56 de carbonization 56 GHG emission reductions 56 decarbonizing 55 CO2 emission reductions 54 conventional combustion engines 54 decarbonising 53 nonfossil 53 EROEI 53 carbon emission reductions 53 Kharecha 53 carbon dioxide emission reductions 52 atmospheric CO2 levels 52 renewables 52 emission reductions 52 usual BAU 52 reducing carbon emissions 52 fossil fuels 52 GHG mitigation 52 stabilizing atmospheric concentrations 52 GHG concentrations 52 anthropogenic emissions 51 decarbonize 51 HFC refrigerants 51 GHG reduction 51 decarbonized 51 CO -2 emissions 51 carbon sequestration 50 Hydrogen Economy 50 decarbonise 50 geological sequestration 50 Phyllis Cuttino director 50 CO2 sequestration 50 Coal gasification 50 carbondioxide emissions 50 reduce greenhouse gasses 50 GHG emitting 50 CO2 emission reduction 49 geoengineering schemes 49 greenhouse gas emission reductions 49 eminently feasible 49 Stephan Singer 49 GHG emission reduction 49 Reference Scenario 49 Iraqification 49 inefficient incandescent bulbs 49 baseload renewable 49 Geoengineering 49 cellulosic fuels 49 relocalization 49 modal shift 49 renewable energies 49 renewable energy 49 sectoral crediting 48 DBCCA 48 artificial photosynthesis 48 ACELA 48 BAU scenario 48 carbon dioxide sequestration 48 negawatts 48 global weirding 48 soil carbon sequestration 48 carbon emissions 48 emission reduction 48 Bio SNG 48 manmade greenhouse gas 48 feebates 48 cap andtrade 48 Carbon sequestration 47 nonfossil fuels 47 finite fossil fuels 47 Plate tectonics 47 economywide 47 algae biofuels 47 LFTR 47 Homogeneous Charge Compression Ignition 47 politically infeasible 47 Mazria 47 anthropogenic greenhouse gases 47 greenhouse gases 47 Dan Kammen 47 nonrenewable fossil fuels 47 thermochemical processing 47 de carbonise 47 sequestering CO2 47 iron fertilization 47 Greenhouse Gas GHG 47 smallest ecological footprint 47 reduce carbon emissions 47 David Roland Holst 47 silver buckshot 47 ozone depleting compounds 47 greenhouse emissions 47 ghg emissions 47 fossil fuel 47 Greenhouse gasses 47 greenhouse gas emissions 47 curbing greenhouse gases 47 EROI 47 Carbon dioxide CO2 47 radiative forcing 47 Solartopian 47 neo classical economics 46 biosequestration 46 RPSs 46 agro fuels 46 emission offsets 46 climate change 46 algal biofuels 46 anthropogenic CO2 46 alternative energies 46 carbon emmissions 46 Roland Holst 46 biomass biogas 46 de carbonize 46 House Gases GHG 46 thorium utilization 46 greenhouse gas GHG emission 46 CHAIRMAN CONNAUGHTON Well 46 Elliot Diringer 46 carbon sequestering 46 Seawater desalination 46 Propane autogas 46 reducing CO2 emissions 46 Tailpipe emissions 46 anthropogenic carbon dioxide 46 terrestrial biosphere 46 Kim Carstensen WWF 46 geothermal tidal 46 thermochemical 46 Peter Frumhoff 46 GHG emission 46 Stuebi 46 biofuels 46 lignocellulosic ethanol 46 Jevons Paradox 46 runaway greenhouse 46 market hypothesis EMH 46 renewably 46 bio diesels 45 GHG emitters 45 Smart Grids 45 sequestering carbon dioxide 45 resource depletion 45 Sugarcane ethanol 45 CO ² emissions 45 deglobalization 45 AEO# reference case 45 megatonne reduction 45 biospheric 45 Graetzel innovation 45 gigaton 45 renormalization 45 CarbonSMART ™ enterprise 45 sulphate aerosols 45 Christopher Flavin 45 GHG emissions 45 #GW [002] 45 Climate Change Mitigation 45 Electrification Roadmap 45 Rams Chevrolet Silverados 45 CO ₂ emissions 45 carbon dioxide CO2 emission 45 Powerdown 45 PHEVs 45 nuclear fission reactors 45 quantified emission 45 Natural Capitalism 45 geologic sequestration 45 Fossil fuels 45 oxy combustion 45 analyst Jens Riese 45 NAWAPA 45 carbon dioxide emissions 45 emitting carbon dioxide 45 desalinating seawater 45 cellulosic feedstocks 45 energy 45 nitrogen oxides NOx emissions 45 Nuclear fission 45 GHGs 45 polluting fossil fuels 45 manmade CO2 emissions 45 sulfate aerosols 45 Greenhouse Gases 45 cofiring 45 Renewable energies 45 breeder reactors 45 HCCI engines 45 carbon emitting 45 economically ruinous 45 Joint Implementation JI 44 nanocatalysts 44 Pacala 44 dangerous anthropogenic interference 44 liquefying coal 44 Kyoto Protocal 44 GHG 44 Gas Emissions 44 Corinne Le Quere 44 photocatalysis 44 cheapest cleanest 44 mimic photosynthesis 44 thermal depolymerization 44 renewably generated 44 NOX emissions 44 reducing greenhouse gas 44 Species extinction 44 greenhouse gas concentrations 44 hydrofluorocarbon HFC 44 greenhouse gasses 44 anthropogenic greenhouse gas 44 carbon capture 44 carbon dioxide concentrations 44 greenhouse gas 44 CO2 44 emitting CO2 44 James Gustave Speth 44 rampup 44 depleting fossil 44 asteroid deflection 44 observable phenomena 44 solar photovoltaics PV 44 Greenhouse Gas Tailoring Rule 44 atomically precise manufacturing 44 Tove Maria 44 biocatalytic 44 SA Asgi SA 44 ethanols 44 combating global warming 44 geoengineering 44 Kurt Zenz House 44 thermal inertia 44 noninflationary 44 prebiotic molecules 44 IPAP2 44 assimilative capacity 44 renewable feedstocks 44 climate forcings 44 distributional consequences 44 geosequestration 44 Solartopia 44 Bio DME 44 Synthetic biology 44 CO2 emissions 44 Jevons paradox 44 renewable 44 Co2 emissions 44 microgeneration technologies 44 fission reactors 44 GHG Protocol 44 Robert Stavins 44 Pareto optimality 44 Karsten Junius 44 global warming 44 beryllium oxide nuclear 44 Repowering 44 UKERC 44 global warming gasses 44 greenhouse gas GHG emissions 44 intermittency 44 atmospheric CO2 concentration 44 GHG greenhouse gas 44 oxyfuel combustion 44 Indian climatologist Rajendra 44 ZEVs 44 Monetarism 44 hybrid powertrains 44 forest thinnings 44 Entega 44 emitting greenhouse gases 44 forcings 44 Poverty eradication 44 RMB revaluation 44 microgrids 43 greenhouse emission reductions 43 anthropogenically 43 Renewable fuels 43 co2 emissions 43 Anaerobic digestion 43 noncarbon 43 smart grids 43 theeconomic 43 emissions 43 Waxman Markey 43 biogenic emissions 43 greenhouse gas emission 43 Sven Teske 43 economywide cap 43 Hans Joachim Schellnhuber 43 multifactor productivity 43 reducing greenhouse gasses 43 Low Carbon Economy 43 reflationary policies 43 #yf 43 smart microgrid 43 heat trapping greenhouse 43 carbon emission 43 Technological innovation 43 House Gases GHGs 43 levelized cost 43 reduce greenhouse gas 43 Smil 43 thermochemical processes 43 V' shaped recovery 43 atmospheric CO 43 greenhouse gases GHGs 43 CO -2 43 Renewable Electricity 43 flywheel UPS 43 environmentally friendly refrigerants 43 Wesoff 43 Renewable Energy Certificate 43 nitrogen fixation 43 glacial interglacial cycles 43 CALSTART 43 multiple equilibria 43 petrodiesel 43 Daniel Kammen 43 Planet Metrics 43 footprinting 43 ZPE 43 Eaarth 43 IGCC plants 43 empirically verifiable 43 SOx emissions 43 environmentally benign 43 hydrocarbon feedstocks 43 mandatory emission reductions 43 urea injection 43 antireflective coatings 43 Renewable energy 43 stabilize atmospheric concentrations 43 alternative fuels 43 greenhouse gas emmissions 43 ATRP 43 biocatalytic process 43 deglaciation 43 catalytic reactions 43 diesel particulate filters DPFs 43 balance sheet deleveraging 43 CAFÉ standards 43 renewable fuels 43 Simon Mingay 43 greenhouse emission 43 consultancy Ecofys 43 amplifying feedbacks 43 GridPoint Platform 43 synthetic nitrogen fertilizers 42 CPV Sentinel 42 ocean fertilization 42 BEVs 42 biobased fuels 42 hybrids electrics 42 exajoules 42 Internal combustion engines 42 emmission 42 glacial interglacial 42 Milankovitch 42 JNNSM 42 James Lovelock 42 RO desalination 42 ecodesign 42 andenergy 42 reduce NOx emissions 42 Canary Initiative 42 Hydrogen Production 42 Oxyfuel 42 Daniel Nocera 42 Zaelke 42 Dolf Gielen 42 exhaustible 42 transboundary waters 42 Technological breakthroughs 42 cleantech startups 42 abiogenesis 42 greehouse gas 42 efficiency retrofits 42 Deron Lovaas 42 effi cient 42 Fuel Obligation 42 RDEG 42 Myron Ebell director 42 CO2 concentrations 42 Greenhouse Effect 42 Greenhouse Gas Reduction 42 vehicles EVs 42 Interconnectedness 42 unfundable 42 planetary warming 42 globalwarming 42 Micro Fuel Cells 42 abiogenic 42 Zhou Dadi 42 Ecofys 42 algal biofuel 42 oilsands extraction 42 ITER fusion reactor 42 Landfilling 42 Global Greensteam 42 Europeanization 42 carbon dioxide emission 42 Neoclassical economics 42 nonrenewable fuels 42 geological epoch 42 Corker McCaskill 42 #ppm CO2 42 distributional impacts 42 hybrid drivetrains 42 ClimateCHECK 42 HFC# 42 carbon 42 thermoacoustic 42 Fluorescent bulbs 42 emission 42 2oC 42 Great Contraction 42 Stavins 42 AGW proponents 42 geo sequestration 42 nitrogen oxide NOx emissions 42 EVs 42 grid parity 42 Waxman Markey climate 42 cellulose ethanol 42 modularization 42 HEVs 42 Rachel Shimshak 42 N2O emissions 42 Ms. Figueres 42 stochastic simulation 42 equilibrating 42 structural readjustment 42 mammal extinctions 42 nuclear fission 42 Rankine cycle 42 marketization 42 Rafael Coven 42 Sidney Ribaux 42 Artificial photosynthesis 42 stratospheric ozone depletion 42 LCOE 42 mntkm 42 IRP# 42 synthetic genomics 42 Mamoru Katou 42 carbon dioxide CO2 emissions 42 Standard LCFS 42 ecological overshoot 42 tailpipe CO2 emissions 42 Nuclear Fission 42 polymer electrolyte membrane PEM 42 Cellulosic ethanol 42 solar geo thermal 42 greenhouse gas GHG 42 pyrolysis oils 42 emissons 42 anthropogenic CO2 emissions 42 cellulase enzymes 42 Nordhaus 42 Palaeocene Eocene Thermal Maximum 42 LifeVillage 42 Tertzakian 42 Claudia Kemfert 42 ppmv 42 burning fossil fuels 42 thermohaline circulation 42 lowest levelized 42 Transport Fuels Obligation 42 harnessing tidal 41 LCP adapts 41 atmospheric carbon dioxide 41 heat trapping emissions 41 ligno cellulosic 41 spacefaring civilization 41 Durwood Zaelke 41 Fischer Tropsch fuels 41 CO2 Emissions 41 linear extrapolation 41 Kyoto Protocols 41 Karl Gawell executive 41 Stephen Pacala 41 Lowell Ungar 41 Judi Greenwald 41 Daylighting 41 hydrologic cycle 41 punctuated equilibrium 41 nitrous oxide emission 41 Waxman Markey bill 41 synfuels 41 Smart Grid deployments 41 sulfur dioxide pollutant 41 cleaner fuels 41 CLIMATE SPECTATOR 41 sustainabilty 41 unconventionals 41 Association EPIA 41 unipolarity 41 Carbon Principles 41 WtE 41 sequester atmospheric 41 hydrological cycle 41 bio fuels 41 GOSAT 41 forest Degradation REDD 41 curbing heat trapping 41 analyst Vangelis Agapitos 41 curbing carbon emissions 41 Envido 41 CO2 emitter 41 ratifiable agreement 41 Sceptical Environmentalist 41 icesheets 41 oxygenic photosynthesis 41 Keeling Curve 41 sequester CO2 41 emmissions 41 Mark Jaccard 41 Earth biosphere 41 atmospheric concentrations 41 Council EREC 41 Haugwitz 41 Carbon Reduction Commitment CRC 41 Renewables 41 GREET model 41 Microgeneration 41 biogeochemical cycle 41 Renewable Distributed 41 atmospheric CO2 41 nanomanufacturing 41 Jiang Kejun 41 guru Amory Lovins 41 levelised cost 41 hydroxyl radical 41 waves droughts floods 41 Exascale computing 41 sequestration CCS 41 biomass 41 terawatt 41 Pacific decadal oscillation 41 Economy CAFE 41 liquification 41 electrolyze 41 nonroad diesel 41 Marlo Raynolds executive 41 biomass combustion 41 Martinez R Fla 41 Han Wenke 41 NAT GAS Act 41 allocative efficiency 41 enery 41 Gunter Pauli 41 fossile fuels 41 Practicable 41 molecular assemblers 41 mean reversion 41 Amory Lovins 41 GSHP systems 41 carbon emitters 41 Anthropocene 41 Planetary Regime 41 getting dirtier costlier 41 MACT standards 41 emmisions 41 Len Coad 41 gigatonnes 41 opoc ® 41 Climate REDI 41 solar photovoltaics 41 Saturn Vue plug 41 polluter pays 41 commercialize cellulosic ethanol 41 Peak Oil 41 permafrost thaw 41 quadrillion BTUs 41 Climate Stewardship 41 Christoph Bals 41 Bio fuels 41 interdepartmental collaboration 41 ZeroPoint 41 GtC 41 cadmium telluride panels 41 CAFE standards 41 biomass geothermal 41 CO2 emission 41 Valuation Informed Indexing 41 emits #g/km [001] 41 Pigovian 41 William Nordhaus 41 externality 41 glacier retreat 41 Hubbert curve 41 externalities 41 mid Pliocene 41 Carbon Sequestration 41 DARREN SAMUELSOHN 41 degression 41 thermochemical conversion 41 growth.â € 41 scalable repeatable 41 Dieter Helm 41 cyclic carbonates 41 Greenhouse Gas Protocol 41 PEMFCs 41 NWND expects 41 hydrocarbon feedstock 41 GHG footprint 41 Eurelectric 41 nonrenewable sources 41 Shrinking glaciers 41 nonfossil fuel 41 Zeebe 41 Bjørn Lomborg 41 extinctions 41 ClimateWorks 41 anthropogenic warming 41 glacier shrinkage 41 Acco2unt 41 CarbonNeutral Protocol 41 EmPower Maryland 41 Dr Raupach 41 PEM fuel 41 Renewable Diesel 41 ethanol bio diesel 41 underconsumption 41 hydrofluorocarbons HFCs 41 inefficient incandescent light 41 photosynthetic organism 41 Dan Woynillowicz 41 GhG 41 manmade greenhouse gases 41 carbon emitter 41 heat trapping pollutants 41 BlueZERO concept 41 ACESA 41 electromobility 41 Sven Teske Greenpeace 41 geothermal hydro 41 switchable batteries 41 diesel aftertreatment 41 SOFCs 41 FBRs 41 Plasma gasification 41 photovoltaics PVs 41 Charles Perrow 41 Global Warming Potential GWP 41 harmful gasses 41 Dialog Semiconductor creates 40 Carbon Emissions Trading 40 Emissions Reductions 40 degrees Celsius above preindustrial 40 equilibration 40 isoprene 40 microeconomic reforms 40 Carbon Dioxide Emissions 40 #.#C #.#F [003] 40 Schellnhuber 40 USEconomic 40 Atlantic Multidecadal Oscillation AMO 40 Storage CCS 40 superconducting materials 40 SmartGrid 40 Crutzen 40 urinary biomarkers 40 Haber Bosch 40 C4 photosynthesis 40 TSCA reform 40 tropospheric ozone 40 gassification 40 LENR 40 Clishem 40 Mokrzan 40 acidic oceans 40 hydrokinetic technologies 40 TEEB 40 Simchi Levi 40 Vehicle Miles Traveled 40 CRC Energy Efficiency 40 Gas hydrates 40 Rahmstorf 40 Hunter Lovins 40 reindustrialization 40 EPAct 40 Gordon Quaiattini 40 biopower 40 Joel Makower 40 gasifying coal 40 Major Economies Meetings 40 emis sions 40 #x'# 40 enthalpy 40 Chem Mod 40 Torrefaction 40 carbon dioxide 40 Acrylic acid 40 ICE ECX 40 CIGSolar 40 Climate Change UNFCC 40 #.#C #.#C 40 Johan Rockstrom 40 FreedomCAR 40 termism 40 Renewable Energy Sources 40 greenhouse warming 40 Clear Skies Initiative 40 perfluorocarbons 40 urbanization industrialization 40 yes sir Mendell 40 Martin Schlageter 40 mantle convection 40 Hans Tropsch 40 catalytic combustion 40 particle colliders 40 MBCx 40 floods droughts heatwaves 40 recoupling 40 carbon neutrality 40 multi celled organisms 40 gasifies coal 40 regulate GHGs 40 BioForming 40 RTFO 40 RDEG technologies 40 cleantech 40 cellulosic biofuels 40 glacial melting 40 Ron Pernick co 40 Climate Pact 40 Bill Chameides 40 HVDC Light 40 Renewable Portfolio Standards 40 expansionary monetary policies 40 VRB ESS 40 greenprint 40 algal biomass 40 Stefan Bielmeier 40 NT Plasmatron 40 Quartet Roadmap 40 productive nanosystems 40 dustier stormier atmosphere 40 phytoremediation 40 Haber Bosch process 40 volcanic aerosols 40 depletable resources 40 Geologic Storage 40 GHG emitted 40 CalCEF Innovations 40 anthropogenic aerosols 40 Ecoscience Population Resources 40 storms floods droughts 40 nitrogen oxide NOX 40 multipolarity 40 hydrogen combustion engine 40 shale tar sands 40 retrofits 40 CO2 Capture 40 Kyoto Treaty 40 contra cyclical 40 Alan Nogee 40 gravitational radiation 40 NAPCC 40 backsheet component 40 Zero Carbon 40 thermal gradients 40 dissaving 40 Hydrogen Fuel Initiative 40 Greenhouse gases 40 instrumented interconnected 40 gigatons 40 realistically achievable 40 particulate filters 40 Fischer Tropsch FT 40 Tailoring Rule 40 DOE SunShot Initiative 40 particulate emission 40 HCCI combustion 40 conventional internal combustion 40 DRIVe models 40 greenhouse gas emitting 40 fuel oxidizer mixtures 40 humanitarian interventionism 40 Greenhouse Gas Emissions 40 oceanographers salivating 40 Biomethane 40 Fuel Obligation RTFO 40 Clare Demerse 40 Earth Overshoot Day 40 Integrated Gasification Combined Cycle 40 warmings 40 oceanic circulation 40 thermoelectric generators 40 macro prudential instruments 40 Earth axial tilt 40 CO2 SO2 40 Integrated Carbon Capture 40 biogases 40 Deborah Seligsohn 40 Andrei Marcu 40 hydrocarbon fuels 40 Pump priming 40 Nabors participates 40 solar irradiance 40 gaseous fuels 40 sequestering carbon 40 Renewables Portfolio 40 GHG emitter 40 technological singularity 40 technological breakthroughs 40 IPCC Intergovernmental Panel 40 environmentally considerate 40 HFC #a 40 NOx 40 Skip Laitner 40 projectory 40 bioenergy 40 concentrating photovoltaics CPV 40 Kyoto protocol expires 40 Sequestration 40 testable predictions 40 acid hydrolysis 40 GhG emissions 40 Kyoto Accords 40 glaciological 40 Sequestration CCS 40 Frank Gorke 40 Industrialised countries 40 SWMPs 40 combustion 40 HOME STAR 40 agrofuel production 40 CO2e emissions 40 Therese Langer 40 Emission Reductions 40 Schumpeterian 40 Co2 emission 40 A1B scenario 40 lignocellulosic biomass 40 desktop virtualization implementations 40 hydro geothermal 40 Fossil Fuels 40 sustainable 40 greenhouses gases 40 biofuel mixtures 40 Sustainable Energy www.sustainableenergy.com 40 chemical reactivity 40 coral reef degradation 40 Alberta Saline Aquifer 40 Ram Oren 40 Emission Reduction 40 becomes scarcer 40 biodiesel feedstocks 40 gasifies 40 CO ² 40 Hironobu Unesaki nuclear 39 carbon dioxide CO ² 39 Biofuels Directive 39 microbial decomposition 39 Greenhouse Gas 39 dirtiest fossil 39 Frank Mastiaux 39 Reducing carbon emissions 39 methane hydrates 39 theoretical underpinning 39 Bose Einstein condensation 39 catalysis 39 IMF Lipsky 39 DNA demethylation 39 Global Warming Pollution 39 Tropical deforestation 39 average megawatts aMW 39 Neanderthal Genome Project 39 coal gasification 39 ratifiable 39 harmful tailpipe emissions 39 Replete electrolytes 39 Matthew Bramley 39 Fuel Standard LCFS 39 REACH Regulation 39 liquefied coal 39 John Drexhage 39 Carbon Capture Storage 39 emitting fossil fuels 39 thermoelectric materials 39 geoengineering techniques 39 emit carbon dioxide 39 batteries supercapacitors 39 Nathanael Greene renewable 39 ACEEE 39 heat trapping gases 39 Fermi Paradox 39 International Geosphere Biosphere 39 Renewables Directive 39 oxy combustion technology 39 String theory 39 delevering 39 CO2 eq 39 costly taxpayer bailouts 39 narcissism Twenge 39 AGGI 39 IGCC plant 39 NGNP 39 Ron Pernick 39 Particle acceleration 39 Halons 39 industrialism 39 Power Usage Effectiveness 39 swifter glossier 39 Li ion batteries 39 Yang Ailun climate 39 biofuel feedstock 39 Medieval Warm Period MWP 39 refrigerant leakage 39 ILUC 39 thermopower 39 Concentrating solar 39 baseload 39 Vinod Khosla venture capitalist 39 PEVs 39 NPP Belene 39 Margo Oge 39 Ricardian 39 stringent emission 39 reprioritization 39 Solid Oxide Fuel Cells 39 Daniel Sperling 39 Carbon Capture 39 Zero Emission Vehicle ZEV 39 global warming gases emitted 39 Climate Impact 39 NEDC cycle 39 Andrew J. Littlefair 39 negawatt 39 Worldwatch 39 greener lifestyles 39 Gaia Hypothesis 39 preindustrial temperatures 39 lithium titanate batteries 39 mediumterm 39 deoxygenation 39 Bill Weihl 39 SBSP 39 Compact fluorescents 39 Yang Ailun 39 gasified coal 39 photosynthetic microorganisms 39 Low sulfur diesel 39 photoionization 39 Emission Trading Scheme 39 RET scheme 39 gigatonne 39 automobility 39 silicon photovoltaics 39 evolving multipolar 39 Carbon Mitigation 39 environmentally beneficial 39 UNFCCC Executive 39 multispeed recovery 39 smallholder agriculture 39 nonpolluting renewable 39 amine scrubbing 39 Decoupling 39 desalinisation 39 Muddle Through Economy 39 RMB internationalization 39 sulfur fuels 39 Mud volcanoes 39 ozone depleting substance 39 chip optical interconnects 39 HFCs 39 Eileen Claussen president 39 Rebalancing 39 R #A refrigerant 39 disequilibria 39 Auris Hybrid 39 Low Carbon Transition 39 protein acetylation 39 Deleveraging 39 Romero Lankao 39 acquiring Engelhard BASF 39 Nicholas Consonery 39 Mike Taugher covers 39 Stahlkopf 39 geoeconomic 39 Global Warming Solutions 39 liquid fuels 39 GEOSS 39 Carbon Emission 39 harmonic currents 39 greenhouse polluter 39 Bio BDO 39 Searchinger 39 Energy Initiative MITEI 39 reregulation 39 Janet Sawin