A recent announcement by the FAO states that world food output must rise by 70% by 2050 to meet projected demand from a growing population and changing diets.

Global cereal demand must increase by about 50%, from 2.1 billion tonnes today to 3 billion tonnes by 205.  Over the same period, meat output must increase by almost 75% by 2050 to 470 million tonnes.

A massive 90% of the needed output is expected to come from higher yields, but the area of land under cultivation is also expected to grow by 120 million hectares.  These increases are most likely to occur in developing regions with large supplies of land per capita, such as sub-Saharan Africa and Latin America.