How Much Land Can Still be Used

My wife and I are down in San Jose del Cabo on vacation this week and yesterday we drove from San Jose to Todas Santos on the Pacific Ocean up to La Paz and then back to San Jose on Highway 1. The key thing that I noticed in the drive was the amount of land being farmed or perhaps I should say the lack of land being farmed.

In many areas we would see a small acreage in vegetables, but there appeared to be an abundant amount of land available to be tilled and farmed. It could be due to a lack of water but I know in my area all of this land would be farmed if there was enough water.  I just wonder how much more land is available around the world in areas like this such as Africa.

We will need to find out in the next 30 years since there will be another 2 billion plus mouths to feed.

For those interested so far my wife has put up with me and has no plans on shipping me home early.