1. Carbon neutral hydrocarbons by Frank S Zeman, and David W Keith Philosophical Transactions A Volume 366(1882):3901-3918 November 13, 2008 ©2008 by The Royal Society

2. Two pathways for using centrally produced hydrogen in the transportation sector. Frank S Zeman, and David W Keith Phil. Trans. R. Soc. A 2008;366:3901-3918 ©2008 by The Royal Society

3. Schematic of routes to CNHCs. Frank S Zeman, and David W Keith Phil. Trans. R. Soc. A 2008;366:3901-3918 ©2008 by The Royal Society

4. Comparison of delivered costs for carbon neutral transportation fuels. Frank S Zeman, and David W Keith Phil. Trans. R. Soc. A 2008;366:3901-3918 ©2008 by The Royal Society

5. Mitigation options based on synthetic fuel production using $100/tCO2 air capture with $10.5 GJ−1 H2. Frank S Zeman, and David W Keith Phil. Trans. R. Soc. A 2008;366:3901-3918 ©2008 by The Royal Society

6. Effect of biomass cost on the cost of producing CO2 for fuel synthesis (dashed line, ideal; solid line, Audus & Freund (2004); dot-dashed line, Rhodes & Keith (2005)). Frank S Zeman, and David W Keith Phil. Trans. R. Soc. A 2008;366:3901-3918 ©2008 by The Royal Society

7. Effect of reduced cost of hydrogen distribution, as measured by market penetration, on the allowable cost of air capture. Frank S Zeman, and David W Keith Phil. Trans. R. Soc. A 2008;366:3901-3918 ©2008 by The Royal Society