Reuters: California’s newly adopted low-carbon fuel standard may mark the beginning of the end of ethanol’s coveted status as the sole U.S. alternative motor fuel. The U.S. state with the most cars late on Thursday approved the world’s first-ever regulations to slash emissions of planet-warming carbon dioxide from vehicle fuels. The ruling, which will be subject to further studies, will not kill the ethanol industry. But it sets the bar higher for cleaner development of corn ethanol, …