Editor's note: To further explore China's new dual circulation development dynamic, CGTN visits two of western China's major cities to look at how the environment there has improved in recent years.

The development of western China's New International Land-Sea Trade Corridor is not only about economic growth, but also about creating a livable environment since both are of equal importance. 

This was apparent in China's southwestern city of Nanning, where the city's government has been making considerable efforts to treat polluted water bodies in recent years. 

Many inland rivers have changed appearance, and become wetland parks with clear water, flowers, and birds. Nanning has set a goal of becoming an ecologically livable city. By the end of October, Guangxi's investment in water treatment had totaled 25 billion yuan, and 70 polluted sources of water had been improved.

Residents in Nanning told CGTN that the environment has improved over the years. "Now the environment has changed. Here's a clear river with flowers and plants. People exercise here every day," said Nanning resident Wei Chengqing. 

"The number of migratory birds we see here has increased in recent years. They also stay longer when they migrate here. It means that the birds also began to like our environment," said Wu Siqian, a birdwatcher. 

"I feel the air in Nanning is fresher, and the landscape is more beautiful. I feel happy living here," said Nanning resident Tang Lili.

'Greening' the Yellow River

The city of Lanzhou, in northwestern China, has also become more environment-friendly. 

The Yellow River flows through the city. In the past, tourists came here to see the desert-like scenery. But in recent years, with the treatment of the Yellow River, tourists are coming for one more purpose: to see the "green" Yellow River.

Lanzhou city officials set strict controls for industrial pollution, clear sewage, restored wetlands, and have limits to avoid over-development. The green plants on the sides of the Yellow River are a reflection of the city's environmental management. 

"Now, if we use a drone for aerial photography, all parts of Lanzhou look beautiful. Lush trees are on the sides of the Yellow River, giving us the feeling that the river is flowing with happiness," said Guo Dejun of the Lanzhou Yellow River Channel Management Station.

(Ge Lin and Gao Songya contributed to this story.)