China could have choked off the Mekong and aggravated a drought, threatening the lifeline of millions in Asia

China’s upstream activities along the Mekong River have long been contentious — but a recent study has sparked fresh scrutiny over its dam-building exercises, reigniting warnings that millions of livelihoods could be destroyed.

A U.S.-government funded study by research and consulting firm, Eyes on Earth, found that Chinese dams are holding back large amounts of water upstream on the Mekong, which exacerbated a severe drought in the Southeast Asian countries downstream last year.

China dismissed the scientific report as “groundless.”

The 4,350 kilometer (2,700 mile) Mekong River runs through six countries. Starting from China — where it is called the Lancang River — it flows past countries like Cambodia, Laos, Thailand and Myanmar, before emptying into the South China Sea via Vietnam.

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Huileng Tan