The rivers in China are awful. For 1.25 billion people, water is the most vital necessity. The great Yellow River dries up 1,000 miles from the coast now. Huge engineering projects to pipe water from the north are staggering in their cost and complexity. The Three Georges dam is a sad necessity, but will probably silt up in 20 years, which was why the USA refused to assist with it. Now the Chinese are going to dam the Mekong river which will affect all of Southeast Asia.
If all of our enviro-whackos really cared about mother earth, they'd be moving to China to protest and to help. The USA, with our huge forests and farming acreage, is a net cleanser of the air, not a net polluter. China has ravaged almost all of her forest land and is reaping the consequences in silted rivers, loss of farmland, and destruction of habitat.
They'd help, all right. They'd become fertilizer, courtesy of the Chicom government.