A new study casts yet more doubt on the notion that biofuels are going to save the planet from global warming and us from paying high gas prices. The report just published by the Government Accountability Office , found much ballyhooed “next-generation” biofuels are likely to have the same kinds of pitfalls plaguing the last. By now, the downsides of the oh-so-last-year corn-based fuels are well known; they use too much water, harmful chemicals and petroleum. This has led some biofuels bo