LHASA - Residents of southwest China's Tibet autonomous region have been mobilized for government-paid patrolling jobs to protect the ecosystem on the "roof of the world." All 3 million Tibetan residents can volunteer to choose these jobs, and most of them opt to do the work part time, according to the department. The cargo truck driver just spent 1 million yuan to build a new house. Qiao Liwen, a 12-year-old primary school student in Lhasa, the regional capital, is among the youngest patrollers. She and other students at Nanmuxiang Primary School pick up garbage on the street and throw it into a garbage classification and recycling station at the school, which they call the "Green Bank."