BIOFUELS: Researchers cut out expensive pretreatment step Amanda Peterka, E&E reporter Published: Wednesday, June 4, 2014 Scientists have learned to convert biomass to fuel without pretreatment, a development that could lead to cheaper biofuels. Please subscribe to Greenwire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.