1. En - ROADS Supporting Data

2. Commercialization Time and Progress Ratios

3. Sources include: Akiner, S. & Aldis, A. (2004), Smil,V. (2006)

4. Progress Ratio is the change in price with one doubling of cumulative installed capacity. A Progress Ratio above 1.0 (100%) means that a doubling of installed capacity increases the cost of the next installed capacity. Ex. - A PR of 0.9 means that, after one doubling of installed capacity, the new price is 90% of the old price. Sources include: Junginger, M., et al. (2010), McDonald, A., Schrattenholzer, L (2001)

5. Source: McDonald, A., Schrattenholzer, L. (2001)

6. World Energy Resources

7. Sources include: IPCC. (2007), World Energy Council. (2010)

8. Sources include: IPCC. (2011), Jacobson, M. Z. (2009)

9. Construction Materials Required

10. Sources include: J. Sullivan, et al. (2010), Kris R. Voorspools, et al. (2000)

13. Source: Greenpeace. (2010)

14. Development and Construction Time

15. Development includes preconstruction activities such as performing feasibility studies, securing financing, identifying and purchasing/leasing a site, obtaining a site permit, approving and issuing a construction permit, and dealing with appeals. Sources include: Jacobson, M. Z. (2009), US Department of Energy (2008)

16. Construction time also includes post construction activities, such as connecting the energy source to the grid. Sources include: Jacobson, M. Z. (2009), US Department of Energy (2008)

19. Lifecycle Emissions

20. Sources include: Hiroki, H. (2005), White, S. & Kulcinski, G. (1998)

22. Efficiency Improvements

23. Sources include: US Department of Energy (2011), US Bureau of Transportation Statistics (2011)

24. Energy Intensity

25. *EIA data for Germany begins in 1991; EIA world data begins in 1994 Sources: World Resources Institute (2011), US Energy Information Administration (2012)

26. *EIA data for Germany begins in 1991; EIA world data begins in 1994

27. Source: World Resources Institute (2011)

29. Source: US Energy Information Administration (2012) *Europe data range for EIA is 1994-2005

30. Source: US Energy Information Administration (2012) *Europe data range for EIA is 1994-2005

31. Sources: World Resources Institute (2011), US EIA (2012), International Energy Agency (2011) *Africa defined as Sub- Saharan Africa by WRI; Asia defined as "Asia (excluding Middle East)" by WRI and "Asia and Oceania" by EIA; Europe data range for EIA is 1994-2005

32. Source: Lawrence Berkeley National Laboratory (1998)

33. Sources: EMF-22, En-ROADS v56n 2.6 w/m2 of radiative forcing indicates a CO2 equivalent concentration of 450ppm 3.7 w/m2 of radiative forcing indicates a CO2 equivalent concentration of 550ppm

34. Sources: LBNL (1998), US Bureau of Transportation Statistics (2011), US DOE (2011)