Ethanol have another more important issue: producible quantity. Brazil have peculiar climate in most of the country, it can, most other countries simply can not

Ethanol have another more important issue: producible quantity. Brazil have peculiar climate in most of the country, it can, most other countries simply can not. That's not a matter of environmental or economical costs but a mere physical feasibility limit. That's an important aspects too many tend to fail considering, for instance "hey, but we can made antarctic bases with food self-sufficiency", yes, we can, for a single base and very few humans inside. With the work of hundred, thousand of others and a tremendous effort: the fact something is doable and done and does work at a certain scale does not means it can work at every scale.