Tourists watch a janitor cleaning the litter on the cliff with a rope tied on his waist on Friday, March 27, 2015. [Photo/IC]

We should seriously not throw litter down mountains.

In Zhangjiajie, a famous scenic area in Hunan province, cleaners work like "spider-men", belaying themselves down on ropes and risking their lives to pick up litter on cliffs that visitors threw down.

Many tourists watched how the janitors work and called for greater consideration by people who littered there.