A problem is that insecticides and artificial fertilizer (two main things not allowed in organic farming) cause ecological problems in the region where the farm is located, even if organic farming would need more farm land in total and would thus destroy nature elsewhere.

Many crops are better grown in greenhouses, where pests can be kept out or controlled without pesticides, and plants can be grown in stone wool and given exactly the nutrients they need. That should count as organic, but unfortunately doesn't.