A footprint is seen on a dried-up reservoir in the drought-hit Luoping County of Qujing, Yunnan province in this March 23, 2010 file photo. Climate scientists, used to dealing with sceptics, are under siege like never before, targeted by hate emails brimming with abuse and accusations of fabricating global warming data. To match feature CLIMATE-ABUSE/ REUTERS/Bruce Li/Files (CHINA — Tags: ENVIRONMENT SOCIETY)