Reuters: The world’s top two producers of ethanol, the U.S. and Brazil, will join forces to speed up research into cellulose-derived biofuels, which use inedible plant matter rather than crops as their feedstock. In a statement they said they would expand scientific collaboration led by the U.S. National Renewable Energy Lab (NREL) and Brazilian oil giant Petrobras’ Center for Research and Development CENPES. The two nations would also to help five countries in Africa, Central America …