BEIJING (Reuters) -The death toll from a landslide in China’s Yunnan province rose to 20 on Tuesday afternoon as rescue workers battled freezing temperatures and snow to locate dozens of missing people. Rescuers worked through the night sifting deep mounds of earth at the site of the landslide in Zhenxiong County, state-owned China Central Television (CCTV) reported on Tuesday. One rescuer said large machines cannot be used due to the unstable soil, according to a report from local media outlet The Cover, owned by the Sichuan Daily Newspaper Press Group. “If the excavation is unloaded below, t…