You raise a good point and I
You raise a good point and I agree with your statement in theory, but I would need numbers to back that up. How much carbon dioxide is absorbed by an acre of forest vs let's say an acre of camelina? I think there are good reasons to not cut down forest that have nothing to do with cutting it down for biofuel. However, given the assumption that you are using an acre of land for fuel production that was otherwise unused, the fuel you produce would be carbon neutral. Of course, there are losses due to power needed to harvest, process, to produce the equipment needed to harvest and process, etc. etc. 100% can never be truly achieved.