Of course the trade off is that the more food we produce (even if it's vegetarian), the more people eat, and then human population grows. The best birth control in the world is quality of life. The more education options, the more comfortable living conditions, the less people reproduce. So not only do we have the option to eat vegetarian once a week...to help with over-population we need to consider how can struggling communities have a better quality of life. But I thought this was a great video, I hope someone makes one for North America, although the stats are similar.