More than 200 scientists from across the country have sent a letter(link is external) to the Obama administration urging the Environmental Protection Agency(link is external) to reconsider a rule, in the final approval stages, that would allow two invasive grasses, Arundo donax(link is external) and Pennisetum purpureum(link is external), to qualify as advanced biofuel feedstock under the nation’s renewable fuel standard(link is external).