Photo Courtesy of Chesapeake Energy Critics have said the entire natural gas production cycle poses environmental risks; industry sources say they are working to improve the process. Related Links: View the Fraking/Drinking Water Infograph DOE Advisory Panel Releases Shale Gas Recommendations Industry sources say they are generally supportive of the recommendations of the Dept. of Energy’s Subcommittee on Shale Gas Production released on August 11. But environmental groups say the report lacks substance, and some are calling for a moratorium until safety and environmental concerns can be addressed.The DOE advisory panel, established at the request of President Obama this spring,
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.