Remember that the reason we use so much land is because that's the cheapest way to grow food. We could grow more food on less land by farming more intensively. We don't because that would make the food more expensive. At an extreme, a greenhouse can increase yields 100x but at an increase in costs of 10x.
Remember that the reason we use so much land is because that's the cheapest way to grow food. We could grow more food on less land by farming more intensively. We don't because that would make the food more expensive. At an extreme, a greenhouse can increase yields 100x but at an increase in costs of 10x.