One of the many climate issues being blamed on global warming is the expansion of deserts. The United Nations says drought could impact 70 per cent of the world's land over the next 15 years.

In China, overgrazing, irrigation farming, and land degradation, combined with drought, are turning more and more fertile land barren.

But, as Al Jazeera's Melissa Chan reports from the Kubuqi Desert, China is launching a new project it hopes will stop the sand spreading.