China’s 2,700-mile water transfer mega-project is new Great Wall

China 's South-North Water Transfer Project spans 2,700 miles and costs $70 billion .

Project aims to redistribute billions of cubic meters of water annually across one of the world’s largest countries.

Project is unique in its scale and scope, designed to secure water supplies for the future by connecting the water-rich south to the parched north.

The South-North Water Transfer Project risks becoming a short-term solution to China ’s water scarcity.

The human cost of the project has been immense, including the relocation of hundreds of thousands of residents.

Experts argue alternative measures could have mitigated the need for such a massive undertaking.

Overusing water in the north, particularly for agriculture, remains an underlying issue.

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