A technical staff analyzes soil samples in a soil remediation laboratory of Hunan Yonker Environmental Protection Institute Co., Ltd in Changsha, central China's Hunan Province, April 28, 2016. Chinese authorities have become increasingly concerned about the risk to food posed by widespread contamination of farmland, and therefore in April of 2014 set up pilot projects in some heavily polluted regions. Hunan, the country's top rice-growing region, has started trial on 183,300 hectares farmland in the process of soil remediation from heavy metal pollution since 2015. (Photo/Xinhua)
