As some wag once said about why real estate is a good investment “They aren’t making any more land”. That applies to agricultural land as well as housing land. There is a finite amount of agricultural land, if you use it to produce sugar you can’t use it to produce grain or pulses or beef or trees.
IOW the fact that the US has largely been deforested is a non-issue because it was deforested for a reason. You can’t simply squeeze ethanol production into already occupied land without displacing something else. And if you displace something else then it will be produced elsewhere. So, for example, if you displace bean production with sugar beet production within the US the bean production will go elsewhere because it is still profitable. And where it goes it will also displace current crops from current agricultural land, possibly in Brazil. And the crop it displaces will then go elsewhere.
It’s a zero sum game. Ultimately most of that diplacement will provide incentive to clear forests to produce the diplaced crops. It matters not one bit that the US has already deforested itself, Brazil will still cut down rainforest to grow soybeans for the US market, just as it is doiing now, if the US won’t grow them itself because the land is being used to produce beets or corn.
Cane sugar remains the easiest way of producing large amounts of sugar in those areas where it can be grown, which is why most of the world’s sugar comes from cane. Sugar cane is inherently a more efficient plant and the sugar is extracted directly from the phloem as sugar, rather than only being produced in those tiny little fruiting bodies as starch and needing expensive chemical refinement.
Grain sugar has an advantage in that it can be produced in a wider range of environments.
That’s exactly what he’s saying. It’s also what Cecil says. “In an analysis published in 2001 in the peer-reviewed Encyclopedia of Physical Sciences and Technology, Pimentel argued that when you add up all the energy costs–the fuel for farm tractors, the natural gas used to distill corn sugars into alcohol, and so on–making a gallon of ethanol takes 70 percent more energy than the finished product contains. And because that production energy comes mostly from fossil fuels, gasohol isn’t just wasting money but hastening the depletion of nonrenewable resources.” Of course Cecil’s column is a couple of years old now and research and technologicla advancement continues apace, but basically ethanol uses slightly to significantly more fuel than it produces.
Is this the case in Brazil? Astoundingly nobody is quite sure, but it’s certainly a close-run race. The trouble is that the exact efficiency of ethanol is dependent on the the season: rainfall, insect population, temperatures, days of sunshine and so forth. As a result the amount of fossil fuel used also varies. Then we have other fluctuating factors like the price of petroleum, the price of labour and so forth. Added to that many factors are very hard to quantify precisely.
But the best figures I’ve seen suggest that Brazil is curently coming out slightly ahead of the game WRT ethanol energy. Because of a highly centralized populaton, limited private car ownership and population centres locate close to production centres as well as a tropical climate ideally suited to cane production as well as some clever and long-term work by the government Brazil gets about 10% (IIRC) more energy from ethanol than it uses to produce it. But, and this is important, I have never seen anyone suggest the US cpould ever achieve this level of efficency. While Pimmental’s figure of a 70% fossil fuel loss form ethcaonl production might be on the high side I’ve never seen anyone suggest that the US could currently save fossil fuels by producing ethanol.