Of course. We were just being metophiric with the whole idea of 1000-1600 sg sq ft of cactus farm. It would take way more than 1600 sq ft.
Ah, but much better to have people living on the cactus farm where nothing much of value grows to free up productive farmland to provide food for the people, yes? Only a tiny percentage of people now have to produce their food where they live when the good farmland is utilized for maximum food production.
That is why I rail so much against the really stupid concepts designed to deal with global warming, even if global warming is happening and is reversible. Ethanol won't reverse it but lessens food supplies and drives up costs. To me that is foolish and counterproductive. It would be practical only if there were not sufficient petroleum supplies to fuel our machines. But we are nowhere near out of the much more effcient petroleum yet and, by the time we do have to transition to something different, I know human ingenuity will have figured something out far more efficient with fewer negative consequences than ethanol to replace it.
We already have government dictating what kind of automobiles we are going to be forced to make and what kind of automobiles it will be legal to drive. We have government dictating what sort of toilets we must use and what kinds of lightbulbs we are allowed to make. If we don't wake up soon, we are at risk of losing the free market system and the consequences will be far more devastating to our quality of life than what is likely cyclical changes in the climate.