There's a TON of productivity gains available using current land. India produces 5x less food per acre than the U.S. We can feed 9 billion using less farmland

There's a TON of productivity gains available using current land. India produces 5x less food per acre than the U.S. We can feed 9 billion using less farmland than we do now if all farms were as productive as the best US tech can provide. plus agriculture tech is progressing very quickly, another doubling of yields is expected in the next decade!