At times，Zhang uses his mobile phone to take pictures of the polluted water.But in comparison，the shortage of water is a problem far more serious than pollution.

　　So far his hiking trips have covered two­thirds of the rivers in Beijing.He is also planning to make a detailed map of rivers in Beijing.“But it is a huge project with large quantities of statistics to be gathered，”Zhang said，adding that he can only work on the project during his spare time.

　　According to Zhang，not all the participants are environmentally active.“Some come to exercise，and some to socialize，”Zhang said.However，that does not matter to him.“I only want the participants to learn about nature and the environment，by seeing it with their own eyes and getting direct experience，”Zhang said.

　　Now，as a regular participant，Chen tells his family to protect water after seeing how water is drying up along the rivers.“I also tell my co­workers to stop drinking bottled water as one bottle of water requires five times that amount to produce，”Chen said.For Zhang，that is the reason why he continues the hikes.“Although I can’t make a living with this，I think it is well worth the effort.”

　　张俊峰每逢周末都去沿河旅行，目的是为了唤起人们对水的保护意识，几年间他徒步旅行观察河流污染和干涸情况，从未间断。

　　1．Zhang Junfeng sticks to hiking along the rivers of Beijing for______.

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