Inner Mongolian herder Dorj looked bitterly at the vast grasslands where his flock once grazed freely, before the practice was banned as part of a massive Chinese state greening project.

Restrictions on traditional grazing are a key part of China's "Great Green Wall" campaign, a decades-old anti-desertification project credited with "greening" over 90 million hectares.

The campaign initially aimed to contain the expansion of deserts in the arid north caused by intensive farming, grazing, mining and climate change.