1. Which areas are you referring to?
And what has caused these areas to become "NOT suitable for farming food crops of any kind."
Many areas have had this tragic fate:
"Our demand to eat animals is responsible for 30-51% of all anthropogenic ghg emissions and climate change, 80% of the deforestation of tropical rainforests, 100% of the overgrazing, 100% of the fisheries collapse, 100% of the food insecurity issues (with factors we can control), and at least 50% of the rapid extinction of terrestrial and oceanic species. This is what needs to be said."
And then we have the issue of the topsoil being destroyed due to raising cattle, which is very important for a diverse and rich plant life:
More than 2/3 of Ethiopia’s topsoil has been lost due to raising cattle. Many countries elsewhere in Africa and in the Amazonian region that suffer from hunger raise cattle inefficiently at the expense of their soil, localized climate, and other resources while producing a fraction of the food they could if converting to plant based foods. This is because of their very powerful cultural factors to raise cattle as well as demand globally and by neighboring countries.
3. Have you even studied the research referred to in http://www.adelicatebalance.com.au/ ?
Save the animals, save the planet, go vegan.
I recommend this book: http://www.worldpeacediet.org