While the federal government continues to tangle with Congress over a climate change law, the California Air Resources Board on Dec. 16 went ahead and endorsed its own cap-and-trade regulation. The measure was a major component in AB 32, California’s climate change law signed by Gov. Arnold Schwarzenegger (R) in 2006. The regulation sets a statewide limit on the emissions from sources responsible for 80% of California’s greenhouse gas emissions and establishes a price signal needed to drive long-term investment in cleaner fuels and more efficient use of energy, according to CARB. It is also designed to provide covered entities
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.