Asian News International: A team of Chinese scientists has made a chemical breakthrough that efficiently turns the lignin in waste products such as sawdust into the chemical precursors of ethanol and biodiesel. In recent years, the twin threats of global warming and oil shortages have led to growth in the production of biofuels for the transportation sector. But as the human digestive system will attest, breaking down complex plant molecules such as cellulose and lignin is a tricky business. The …