[[Fil:NREL FT diesel vs conventional diesel photo.jpg|thumb|Sammenligning af Fischer-Tropsch [[syntetisk brændstof]] (kunne være CO2-neutralt) og konventionelt brændstof. Den syntetiske brændstof er klart som vand grundet næsten fravær af [[svovl]] og [[aromatiske kulbrinter]]. Den syntetiske brændstofs renhed kan betyde renere forbrænding (mindre [[luftforurening]]) eller længere levetid af evt. anvendte [[brændselscelle]]r.]]
'''Kulstofneutrale brændstoffer''' kan henføre til mange forskellige energibrændstoffer eller energisystemer, som netto ikke beriger atmosfæren med [[CO2]]. En klasse er [[syntetisk brændstof]] (inklusiv [[methan]], [[benzin]], [[dieselolie]], [[jetbrændstof]] eller [[ammoniak]]<ref>Leighty and Holbrook (2012) [http://www.intpowertechcorp.com/ASME-IMECE-12-87097-FINAL-30Jul12-C.pdf "Running the World on Renewables: Alternatives for Transmission and Low-cost Firming Storage of Stranded Renewable as Hydrogen and Ammonia Fuels via Underground Pipelines"] ''Proceedings of the ASME 2012 International Mechanical Engineering Congress & Exposition'' November 9–15, 2012, Houston, Texas</ref>) produceret via [[vedvarende energi]] ved at anvende [[hydrogenering]] af [[carbondioxid]] hentet fra luften.<!--
1--><ref name=Zeman2008>{{Cite journal |last= Zeman |first= Frank S. |last2= Keith |first2= David W. |date= 2008 |title= Carbon neutral hydrocarbons |journal= [[Philosophical Transactions of the Royal Society A]] |volume= 366 |pages= 3901–18 |doi= 10.1098/rsta.2008.0143 |url= http://www.keith.seas.harvard.edu/papers/103.Zeman.2008.CHNCs.e.pdf |access-date= 7. september 2012 |archive-date= 25. maj 2013 |archive-url= https://web.archive.org/web/20130525135837/http://www.keith.seas.harvard.edu/papers/103.Zeman.2008.CHNCs.e.pdf |url-status=dead }} (Review.)</ref><!--
2--><ref name=Wang2012>{{Cite journal |last= Wang |first= Wei |last2= Wang |first2= Shengping |last3= Ma |first3= Xinbin |last4= Gong |first4= Jinlong |date= 2011 |title= Recent advances in catalytic hydrogenation of carbon dioxide |journal= Chemical Society Reviews |volume= 40 |issue= 7 |pages= 3703–27 |doi= 10.1039/C1CS15008A |url= http://pubs.rsc.org/en/content/articlelanding/2011/cs/c1cs15008a |access-date= 6. juli 2013}} (Review.)</ref><!--
3--><ref name=MacDowell2010>{{Cite journal |last= MacDowell |first = Niall |date= 2010 |title= An overview of CO<sub>2</sub> capture technologies |journal= Energy and Environmental Science |volume= 3 |issue= 11 |pages= 1645–69 |doi= 10.1039/C004106H |url= http://pubs.rsc.org/en/Content/ArticleLanding/2010/EE/c004106h |access-date= 7. september 2012|display-authors=etal}} (Review.)</ref><!--
4--><ref name=Eisaman2012>{{Cite journal |last= Eisaman |first= Matthew D. |date= 2012 |title= CO<sub>2</sub> extraction from seawater using bipolar membrane electrodialysis |journal= Energy and Environmental Science |volume= 5 |issue= 6 |pages= 7346–52 |doi= 10.1039/C2EE03393C |url= http://www.researchgate.net/publication/237005785_CO_2_extraction_from_seawater_using_bipolar_membrane_electrodialysis/file/e0b4951ad93e3f2418.pdf |access-date= 6. juli 2013|display-authors=etal}}</ref><!--
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Sådanne brændstoffer er potentielt [[kulstofneutrale]] fordi de netto ikke bidrager til atmosfærens CO2.<!--
5--><ref name=Graves2011rev>{{Cite journal |last= Graves |first= Christopher |last2= Ebbesen |first2= Sune D. |last3= Mogensen |first3= Mogens |last4= Lackner |first4= Klaus S. |date= 2011 |title= Sustainable hydrocarbon fuels by recycling CO<sub>2</sub> and H<sub>2</sub>O with renewable or nuclear energy |journal= Renewable and Sustainable Energy Reviews |volume= 15 |issue= 1 |pages= 1–23 |doi= 10.1016/j.rser.2010.07.014}} (Review.)</ref><!--
6--><ref name=Socolow2011>{{Cite report |last= Socolow |first= Robert |date= 1. juni 2011 |title= ''Direct Air Capture of CO<sub>2</sub> with Chemicals: A Technology Assessment for the APS Panel on Public Affairs'' |publisher= American Physical Society |type= peer reviewed literature review |url= http://www.aps.org/policy/reports/assessments/upload/dac2011.pdf |access-date= 7. september 2012|display-authors=etal}}</ref>
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