A battle is brewing in the Senate over Alaska Republican Lisa Murkowski’s proposed “resolution of disapproval” to block the Environmental Protection Agency from moving forward with plans to regulate greenhouse gases under the Clean Air Act (CAA). Murkowski’s proposal, introduced on Jan. 21, expresses congressional disapproval for EPA’s finding issued late last year that greenhouse gases pose a danger to public health and welfare. The resolution would need Senate and House approval and President Obama’s signature before taking effect. At least 25 Republicans and Democrats Ben Nelson (Neb.), Blanche Lincoln (Ark.) and Mary Landrieu (La.) back Murkowski’s measure. It needs
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.