Source: CO2 Science
Yang, Q. and Chen, G.Q. 2012. Nonrenewable energy cost of corn-ethanol in China. Energy Policy 41: 340-347.
The authors write that “interest in bio-ethanol as a substitute energy supply for nonrenewable fossil fuels has been growing since [the] 1990s in China,” and they say that “after Brazil and the US, China has recently become the third largest ethanol producer and consumer.” In this regard, however, they note that after it was suggested by Chambers et al. (1979) that the production of corn-ethanol might use more energy than it delivers, “numerous studies of the net-energy value of the bio-ethanol have been reported in many countries,” and they cite a group of 26 reports that “provide very different results, with net energy values ranging from highly positive to negative.” (more…)