photo Courtesy of Poet-DSM The EPA is expected to cut biofuel requirements for 2014, putting plantssuch as this one in Emmetsburg, Iowaat risk. Related Links: Kansas Ethanol Plant Prepares To Fire Up Anaerobic Digester China Backs Cellulosic Ethanol Producer That DOE Rejected A trio of cellulosic ethanol plants in the final stages of construction in Iowa and Kansas are being threatened by an Environmental Protection Agency proposal aiming to cut federal renewable-fuel mandates.Officials at Poet-DSM, Dupont Chemical and Abengoa Bioenergy say the plants—each worth $200 million to $250 million—have taken more than a decade to develop and build. According to
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.