National Public Radio: Getting fuel from green plants seems like a great idea. But scientific research over the last few years shows that biofuels aren’t necessarily helpful in combating global warming. Based on this data, the EPA has drafted new, tighter regulations that could make it harder for the biofuels industry to grow. In theory, biofuels themselves don’t add any extra carbon to the atmosphere. Green plants take carbon dioxide out of the air, so when you burn them, the carbon dioxide just goes back …