Sen. John Barrasso (R-Wyo.) has put a “hold” on the nomination of Regina McCarthy to head the Environmental Protection Agency’s Office of Air and Radiation. The Environment and Public Works Com- mittee cleared McCarthy’s nomi- nation on April 23, but Barrasso is concerned about her support for EPA’s recent finding that greenhouse gases may pose a public-health danger. The action blocks a floor vote on McCarthy.
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.