Environmentalists are taking their case that corn-based ethanol is bad for the planet to the state that makes more of it than any other: Iowa.
They are bird-dogging presidential candidates such as Elizabeth Warren and Cory Booker at rallies and town halls, trying to dissuade them from making politically convenient pro-ethanol pledges to get votes in corn country. Their message: biofuels are driving environmental harms, from disappearing wetlands to algae blooms in the Gulf of Mexico.
