In 1994, China began work on the world"s largest dam project, the Three Gorges Dam that spans the Yangtze River in Hubei province, China. It was completed in 2009 and is the largest hydro-power station in the world, with an annual energy output of 84.7 billion kilowatt-hours. The dam is 1.3 miles wide, over 600 feet in height, and has a reservoir that stretches 405 square miles. It has a generating capacity of 22,500...