More than enough farmland?

Apparently, new studies are arguing that we have more than enough farmland worldwide to feed everyone. The conclusion then becomes that we can start converting some of that farmland to protected natural space. Perhaps it is because the study is assessing farmland worldwide (instead of considering its distribution), but these numbers seem hard to accept. (also unclear if the report fully considers climate change implications). If this assessment is correct, what should that mean for all the programs across the nation working to protect ag land?

by the way, the UN has reached a very different conclusion assessing the need for many millions of addition acres.

Jessie Owley