Farming is about economics. Good farmland is a place which given todays prices has enough profits to be worth farming on.
In general, people has been proportional spending less money on food for each decade that has gone past. Production per acer has also gone up, while the number of people working as farmers has significant dropped.
I am pretty sure that the reason why there is not more potato farmers in the world is because the price of potatoes are not high enough to utilize all the land where potatoes can be grown.
But even if we somehow run out of land we would still not need to build arcologies. The primary reason we don't have many seaweed farms in the world is because few cultures has seaweed as an primary diet. Economics could likely change that.
In general, people has been proportional spending less money on food for each decade that has gone past. Production per acer has also gone up, while the number of people working as farmers has significant dropped.
I am pretty sure that the reason why there is not more potato farmers in the world is because the price of potatoes are not high enough to utilize all the land where potatoes can be grown.
But even if we somehow run out of land we would still not need to build arcologies. The primary reason we don't have many seaweed farms in the world is because few cultures has seaweed as an primary diet. Economics could likely change that.