by yeahbut » Tue 08 Jul 2008, 18:29:29
$this->bbcode_second_pass_quote('MrBill', 'N')o, not at all. All serious questions. I saw some elephant grass (or maybe bamboo grass) growing today. It is the beginning of July and it must already be 60 feet (20 meters) high? Those are perrennial grasses, so they pretty much grow wherever they take root. We need to unlock the secret of making cellulosic ethanol out of such fast growing, hardy plants.
...I do not think there are any easy answers. We cannot simply substitute fuel for food on productive agricultural land. We need to expand fuel production onto currently non-productive land.
Sorry to cherry-pick from such a well constructed post, but for me this is the pointy bit of the issue. I agree that cellulosic ethanol from marginal land crops may help reduce the pressure on food from biofuels. I just don't think we're seeing much evidence that that is the main direction of the biofuel industry. Perhaps when all the technical obstacles are ironed out, it will start heading that way, but right now and for quite some time to come, crops that are in direct competition for land with food crops will be used for fuel.
Some other things to watch if and when cellulosic ethanol becomes a practical, large scale reality(from the perspective of biofuel pressure on food), are 1)will the 'marginal land' crops actually be grown on marginal land? Switchgrass, bamboo, willow etc will grow faster on good land, like any other crop. If there's good money to be made growing cellulosic ethanol crops, farmers may well choose to plant them on the land that grows them the best, as well as marginal land
2)fertiliser will be a big part of marginal land cropping. Just because a plant can survive in marginal conditions doesn't meant it won't do a lot better with some help. Farmers growing these crops will certainly use fertiiser to maximize their their returns=more pressure on food production costs
3)not within the biofuel/food parameters but worth thinking about, is what the term 'marginal land' actually means. It's probably quite flexible. It could easily mean land that has been recently deforested and cropped a few times until the soil is degraded, like large swaths of the Amazon. It also means land that we haven't had any commercial use for until now, and where plants, animals, pollinators etc are managing to survive, for now.
$this->bbcode_second_pass_quote('', 'U')PDATE:
In Chicago, spot corn hit a record high of $6.43 a bushel and corn for delivery next year – by which time the US forecasts that about 33 per cent of its corn crop will be consumed by the biofuels industry – hit a high of $6.97 a bushel.$this->bbcode_second_pass_quote('', 'S')A — thanks for the comment. I agree that the core source of demand for corn is animals — ergo, rising demand for chickens and pork and beef as a growing group of consumers reaches an income level that allows more consumption of meat. that said,
I am a bit surprised that the resevoir of spare agricultural capacity — which seemed large in the 80s, in much the same way that the saudis had spare pumping capacity — has been depleted so fast. But many important things happen when you aren’t watching closely.
More reasons why I think corn is not the way to go with ethanol, plus this comment that echos my own sentiment at how fast we went from over-supplied to under on that J-curve