United has been something of a pioneer in the field, having also conducted flights powered by algae-based biofuel a few years back. But agricultural waste biofuel is a rather new field; we’re just now experimenting with everything from slaughterhouse waste to straw-powered cars. Agriculture produces a phenomenal amount of leftovers, no matter how it’s done. Most plants are only grown for a small edible percentage of their overall mass, and livestock produce mas
