Concerns about global warming will determine the energy future of the world. If global warming as a result of human created CO2 is a concern than biofuels look good. They do decrease the food supply but we've got to save the earth so we might as well kill a few people by starving them to death instead of having many more killed in a global climate catastrophe. If human created CO2 is not the source of global warming then biofuels are an awful solution to the problem of fossil fuel depletion because they deplete top soil and decrease the food supply. In this case Coal and Gas to Liquids and Microwaving oil shale In-Situ are much better options for our energy future.