Business Green: Californian regulators this week approved tough new standards governing the carbon intensity of bioethanol that will force producers to account for the lifecycle emissions that result from the production of biofuels. The Californian Air Resources Board (CARB) said the new Low Carbon Fuel Standard (LCFS) will reduce the carbon intensity of transportation fuels used in California by an average of 10 per cent by the year 2020, by forcing bioethanol producers to measure the emissions that …