However, the fundamental problem with biofuels overall is that fuel requirements are so huge. Indeed, total annual fossil fuel usage -- coal, oil and natural gas -- is an appreciable fraction of total annual biomass production through photosynthesis. Everything, all plants, everywhere. The reasons being that energy requirements are so much greater than food and feed requirements, and that photosynthesis is so inefficient compared to PV.

Human land use is a major factor in the current great extinction. Adding large-scale biofuel production would increase extinction rates. But of course, global climate change is also a major extinction driver.

PV and batteries are clearly the way to go.