There is a stat going around which states that !if everyone went vegetarian we could free up 80% of the farm land", yet with comments like double cropping per y

There is a stat going around which states that !if everyone went vegetarian we could free up 80% of the farm land", yet with comments like double cropping per year which we see in the UK that 80% figure should actually be a lot lower especially if fallow time was factored in. So if fallow time was factored in, in reality we have probably already run out of farm land to grow livestock and are at or just exceeding the available farmland to grow nutritional crops! It makes the MIT population collapse model prediction for a global collapse in society by 2040 seem more believable when looking at the lack of farmland this planet has to grow decent nutritional crops.