Lanzhou University
A report compiled by [[Lanzhou University]] in 2006 had warned that the felling of the forests around Zhouqu for coal mining and agriculture would cause heavy [[soil erosion]] and destabilize hillsides. The construction of a major highway and more than 40 hydroelectric dam and recovery systems in the steep valleys acted to further destabilize the local [[geology]], according to leading Chinese geologist [[Fan Xiao]].