China's "Great Green Wall" is a huge ecological engineering project to slow the expansion of the Gobi and Taklamakan deserts in the country's north.
Since 1978, China has planted more than 66 billion trees along its borders with Mongolia, Kazakhstan and Kyrgyzstan — and Chinese authorities plan to plant 34 billion more over the next 25 years. If they succeed, the Great Green Wall will increase Earth's forest cover by 10% since the late 1970s.
