China’s ambitious push to use biofuel in cars nationwide by 2020 is in doubt amid concerns about supplies of raw material such as corn, complicated by an escalating trade dispute with Washington, producers and analysts say.  In September last year, the government outlined radical plans to roll out the use of ethanol in gasoline nationally by 2020, in part to digest its huge corn stocks. State-controlled producers, like China’s State Development & Investment Corporation (SDIC), agribusiness COFCO and Jilin Fuel, rushed to draw up plans to invest billions of yuan to double output in the world’s largest car market. But since then, only one major project – SDIC’s 300,000 tonnes per year plant in Liaoning province in […]