China's Premier Li Qiang announced construction had begun on what will be the world's largest hydropower dam, located on the eastern rim of the Tibetan Plateau and estimated to cost around $170 billion,

China has started construction of the world’s biggest hydroelectric dam, a project that’s set to be far larger than the Three Gorges Dam — already the world’s biggest single source of green power — and more expensive than the International Space Station.

The Indian and Bangladeshi governments fear the project could have major impacts on millions of people living downstream.