On Capitol Hill, a group of Democrats are threatening to derail a landmark climate and emissions bill to address concerns by the nation’s ethanol producers. The bill would cut greenhouse gas emissions 17 percent below 2005 levels by 2020 and 83 percent by 2050. House Agricultural Committee Chair Collin Peterson says he’s gathered forty Democrats to oppose the measure unless it counters a recent EPA finding that “indirect land use” must be taken into account when calculating ethanol’s carbon footprint.