Organic and sustainable methods are more efficient, even without GMOs [1]. It is a myth that GMOs or high-tech is the answer to food production/land scarcity concerns, as simply managing a farm properly can lead to yield increases multiple times over conventional, unsustainable methods (annual tillage, broad spectrum pesticides, etc). This is in part because GMOs that are in wide use are little more than ways to deal with pests or herbicides, which high efficiency sustainable farms deal with much more cost-effectively anyway.

[1] https://www.greenbiz.com/article/how-mini-farms-can-yield-fo...