Figure 7.

Fossil energy use in the life cycle of biofuels. Based on data from [17–19,40,47,48,54,55,57,58,60,68,76,77,80,85,89,92,93,95,96,98,108,113–115,120,121,129,132,133,136,138,139,143,144,147,152–154,156,159,161,162,164–167,169–171,175,176, 179–181,187,190–192,195–199,204,206,208,219–223]. For the box plot legend, see electronic supplementary material, figure S1 and for the data used to plot this graph, see electronic supplementary material, figure S7. The value for third-generation biodiesel should be multiplied by 10 to obtain the actual value. ‘A’ refers to the number of LCA articles found in the literature and ‘n’ denotes the total number of analyses. (Online version in colour.)