Biofuels from cropland increase global warming

Two studies released today say that producing biofuel on cropland causes land in native ecosystems elsewhere being converted to cropland resulting in an increase in greenhouse gases. This is a blow to the ethanol and biodiesel movement unless they can find ways to produce their fuel from waste products or from non-cropland. Another lesson is that conservation is key - driving less, fuel economy, eating lower on the food-chain, etc.