So what's you're point here Billy? You recognize that it's true for Corn, but refuse to acknowledge that it can be true for Sugar cane.
No exactly the opposite. I said anything, including growing cane, can be done in an unsustainable fashion. That was why I said you statement that growing sugar cane could become unsustainable, despite its ~300 years of sustained production, had no content. Is obviously true. Just like glass can be broken is obviously true, but not worth posting about.
Because slavery is clearly both ethical and sustainable. Right Billy?
Now most of the world agrees with that "No Slavery" POV, but historically, Slavery was considered the natural state of men in societies, sanctified in the Bible and most if not all "holly books" and earlier laws, including those of the US, even the constitution of the US, etc.
There is a modest size city in Brazil about 60 miles west of Sao Paulo called "Americana." Slavery was on its way out but still legal in Brazil, but not the importation of slaves, when the US had its civil war and Lincoln decreed the US's slaves free (Mainly as a war measure as they were the "supply chain" for the South's soldiers). Near the end of that war and in the years immediately after it, quite a few Southerners, seeing their slave based way of life being destroyed, came to Brazil and settled where the city Americana is now. It still, but without slaves of course, produces food and fiber for Sao Paulo etc. but not as economically as an even larger group of Japanese immigrants to Brazil does.
To quote you: "The point that you miss is that things have changed between then and now." except I don't "miss that." What is ethical, moral, etc. changes as it is not a law of nature, but a social construct.
...I help with fundraising at my childs school as well. What's your point?
You had noted there were problems with the way the modern world is run / operates. I agreed and used that as an opportunity to again repeat my point, which I have made in many posts, that the fundamental reason for this social failure is that the masses are not well educated. Can't think for themselves, do critical analysis etc. so are easily exploited by the rich and powerful few, especially now that most in US at least have TVs. In the US it is the local funding of schools that must change, so ALL have at least the opportunity to get a good education, not just the kids whose parents have enough wealth to buy home where the schools are good, as I did.
... Potentially {for enough sugar cane to fuel all the world's car}:
Pasture will have to be cleared and converted.
Wheat production will have to be cleared and converted.
Sheep/beef production will have to be cleared and converted.
All this is an unsupported claim and false. BTW where wheat will grow well sugar cane will not. Brazil must import almost all its wheat. There is still a great deal of arable land, where the grass, called sugar cane, will grow well but much of that land is managed the way the "Old South" grew cotton. "I. e. Exhaust the soil and move on." For example, just before moving to Brazil, selling all property etc. I had in US, I bought a run down farm of about 100 acres (with two small 2-bed room houses and a small lake with fish for only $23,000 as then all who had any wealth were disparate for dollars.) - That was my "plan B" if the beautiful lady professor* I would live with in her owned apartment, did not work out as we hoped.
The farm was quite hilly with pasture so poor than it only supported 5 scrawny cows - they spent too much energy climbing up and down hills. I spent about $3000 dollars on plowing the weeds under (green fertilizer) and new grass seed. I also found a spring higher than most of the land and with cheap plastic hose made 5 or 6 slightly lower, open top, stone water tanks, so thirsty animals would not need to walk back down into one of the three valley creeks to get a drink. Ten years later when I sold the farm, just the cash from my 50 fat steers repaid for everything, more than two fold in dollars as then it only took half as many Brazilian Real to buy a dollar as when I bought the farm - Brazil was more prosperous than now.
Point is that still in Brazil and most of the world, there is a huge amount of very under-utilized and poorly managed (or even totally abandoned) pasture land - only tiny fraction of which could supply all the sugar cane needed for all the world's cars. Typically, that under-utilized land is, like my farm, too hilly for mechanized harvesting. A fraction of my plowing was done by tractor, but more by a team of four oxen. (Plow only down hill then climb back up with plow out of ground.) It was amazing to watch the driver of the oxen control them with just words and the threat of his tiny whip. Harvesting sugar cane manually was the only way it was done about a decade ago and will provide many badly needed low skill jobs, if all the world's cars are using alcohol fuel.
* She has more wealth than I do (inherited many buildings that are rented) After we had lived togethers for 10 years, we, especially she, became concerned that if we died in a comom accident, my children could claim half her wealth as we were "common law wed." Fortunately, Brazil has several different types of marriage. Our's is one called (in translation) "total separation of wealth." - No need for any "Pre-nuptial agreement" and unlike those, lawyers can not challenge it. Her kids by prior marriage get her wealth and mine, my wealth.