Growing crops for biofuel cannot produce more carbon than it consumes over long time scales, because the only source of carbon available to the system is the carbon in the atmosphere. If they are saying biofuels aren’t carbon neutral over long time scales, where is this extra unlimited supply of carbon coming from?
Growing crops for biofuel cannot produce more carbon than it consumes over long time scales, because the only source of carbon available to the system is the carbon in the atmosphere. If they are saying biofuels aren’t carbon neutral over long time scales, where is this extra unlimited supply of carbon coming from?