Here are a couple of the answers Deng Fei received directly on Weibo:

"If you want to investigate pollution of water underground, please come to Heze. There are many chemical plants here, but there is no formal sewage treatment plant. Waste water has been pumped into the ground for a decade. My home town is 30 kilometres from the city, and since we don’t have running water, we drink water from the ground. The water has tasted bitter for several years now. People don’t know if it’s harmful; please help us."

"Neijing River is the main river in Honghu, Hubei province. It connects Honghu Lake to the Yangtze River. Ten years ago, people swam, rowed dragon boats, and washed their vegetables in the river. Now, the river is covered in weeds and garbage. I hope the government can do something to save our lakes and rivers."