Those would be the regions that live sustainably - e.g. low insecticide use, but currently have relatively low crop yields that can be improved by adopting some

Those would be the regions that live sustainably - e.g. low insecticide use, but currently have relatively low crop yields that can be improved by adopting some non-harmful modern techniques, like mechanization. You can also compare the average amount of garbage thrown out by a family - developed nations generate a lot of of waste and a lot of greenhouses. If we're capping population growth, the most wasteful regions should be the first.