China starts construction of Tibet mega-dam

Beijing approved the project in December on the river -- known as Yarlung Tsangpo in Tibet and Brahmaputra in India, linking it to the country's carbon neutrality targets and economic goals in the Tibet region.

Once built, the dam could dwarf the record-breaking Three Gorges Dam on the Yangtze River in central China -- and have a potentially serious impact on millions of people downstream in India and Bangladesh.