It is not all in the numbers…
Check it out:

The challenge of feeding an additional 2 billion people by 2050 has generated considerable discussion since 2009 when the United Nations Food and Agricultural Organization (FAO) suggested that we would need to increase agricultural production by 70 percent over the 2005-2007 period level to feed 9 billion in 2050.

Others have used the figure of 100 percent. Since then everybody and their brother has used the need to increase agricultural production to pitch their own product. But before we get all excited, we need to ask ourselves, “What’s behind those numbers?”