Why do lakes in China turn green? Report finds surprising new culprit.(Read article summary)
In China, known as the world’s factory, a significant portion of water pollution actually comes from farms, a government report revealed Tuesday.
They all exist, of course. But a Chinese government report published Tuesday points out a little known fact: Nearly half of the pollutants that poison China’s waterways come from farms.
Agriculture, in one form or another, is to blame for 43 percent of China’s “chemical oxygen demand” or COD – a commonly used measurement for water pollution – according to a new census of pollution sources.
Every now and again they become visible – when a lake turns vivid green or bright blue for example, because the nitrogen runoff from fields has fed algae that bloom extravagantly.
Those algae also suck all the oxygen out of the water, and the fish suffocate. It happens quite a lot in China.