Tajikistan is fully investing in hydropower by building the Rogun Dam, which will be the world's tallest dam upon completion.

In the developed world there is really nothing natural about the way we get our water. Dams produce hydroelectric power and the reservoirs behind dams store water supplies for the long haul.

The structure would be called the Grand Inga Dam. Located in the Democratic Republic of Congo, it would have twice the power generation of China's Three Gorges and, therefore, be the world's largest ...