No argument here MS in relation to the study, which was done in the 70's. It was based on what was known as possible at the time.

Didnít know the world was so dependant on the US for food. But, driving outside of the major metro areas you'll see most of the US is rural. Is it me or is there a gazillion corn fields in the US? lol. Though rain forests serve a purpose algae produces far more O2.