Turning to China's water challenges. Sanjiangyuan, or literally "Source of three rivers", is an area of the Tibetan Plateau in China's Qinghai province. It is also called China's water tower. Our reporter Han Bin went to the region. There, he found out that the melting snow may signal an impending water crisis, and how the local Tibetans are working to keep China's key water source clean and running.

The Bangqiong Monastery sits on the edge of the Tibetan Plateau. 52-year-old Jamyang Nordrup takes water from the foot of the mountain every day. For thousands of years, the water has given life to the lamas and local herdsmen.

But over the past years, Jamyang Nordrup says he has seen the lakes disappearing, and mountain snow melting. Tibetans worship the purity of water. They believe every river, blade of grass and even stone, has its own life, and cherish deep feelings for them.

The lama hopes the changes to the environment will slow, and people can do something to save the eco-system, that once provided so much. What he doesn't know is that changes on the plateau have a huge impact on other changes. The eco-system governs the weather system and determines the amount of water.

JAMYANG NORDRUP, LAMA BANGQIONG MONASTERY, YUSHU TIBET AUTONOMOUS PREFECTURE "I remember when I first arrived here at the age of 18, the river in front of the monastery was so big that we had to cross on horseback. The grass used to be so high that it could hide animals. There was a lot of livestock as well. Now, the water is much less."

Jamyang Nordrup wants more Tibetans to know about the environmental changes in Sanjiangyuan. He has become a water ranger. He is actively engaged in conservation and campaigning. Water at Sanjiangyuan used to be endless and almost all of it was drinkable. Now, things are changing. Jamyangnordrup is aware of the problem. As climate change continues to heat up, he prays that China's water tower, will survive the crisis, and the Bangqiong Monastery will continue to serve for thousands of years more.

China is not a water-rich country. And water is not evenly distributed across the vast land. Add to that over-capacity and fast development. Even worse, much of the surface and groundwater has been polluted. The government is now working hard to change it. But the effects of China's water woes will continue to be felt for a very long time.