The water diversion project, given its unique characteristics, has no comparisons. But its impact on the environment and the rivers' eco-system and the people is not difficult to understand.

True, it will bring joy to the parched lands of North China, come as a boon to northern Chinese cities facing water scarcity and help economic development. But its impact on the environment and the eco-system cannot be said to be as positive.

The Yangtze River has already paid a heavy price for the country's fast-paced economic development. The quality of water has deteriorated in the lower reaches of the river, and some species have already become extinct while others are on the verge of being lost forever. Only a few lakes remain connected to the Yangtze, increasing the risk of floods downstream, and dams - big and small - have blocked the natural flow of migratory fish and thus compromised biodiversity.

The Yangtze River region suffered its worst drought in 50 years in 2011 because of the shortage of rainfall - and, according to some environmental scientists, after the Three Gorges Dam was built.

Besides, changing weather patterns have had an impact on China, too, where it has been raining more (than usual) in the north and less (than normal) in the south. The new situations have also added to people's worries about the project.

This is something that only the authorities can answer. But there is no reason to think that they have not assessed the risk factors associated with the project. Here's hoping their risk assessments and reviews are proper.

The author is a senior editor with China Daily. oprana@hotmail.com

(China Daily 01/10/2015 page5)