Construction of the world’s biggest hydropower megadam has begun, China’s premier has said, calling it the “project of the century”. The huge structure is being built on the Yarlung Tsangpo river, in Tibetan territory. Li Qiang made the comments on Saturday, at a ceremony in the region to mark the start of the build, leading Chinese markets to rise on the expectation of the long-planned megaproject, first announced in 2020 as part of China’s 14th five-year plan. The dam has drawn criticism from India and Bangladesh, through which the river…