They may have guarded the tomb of China’s first emperor for thousands of years, but the terracotta warriors are facing their toughest battle yet. The life-sized clay figures unearthed three decades ago in Shaanxi province are starting to fall apart and Chinese and US scientists have launched a two-year research project to study the impact that indoor air pollutants are having on the Emperor Qin Terracotta Warriors and Horses Museum in Xi’an.
