Villagers of Liangli Village prepare to mould a biogas pit in Fengshan County of southwest China's Guangxi Zhuang Autonomous Region, August 22, 2009. Fengshan County has been encouraging people to build biogas pits in rural areas so as to develop ecological agriculture in recent years. About 870 biogas pits have been put into use from January to July of 2009, increasing the coverage of household biogas to 77 percent in rural areas of Fengshan County. [Xinhua]

Villagers of Liangli Village prepare to mould a biogas pit in Fengshan County of southwest China's Guangxi Zhuang Autonomous Region, August 22, 2009. [Xinhua]