Large proportions of the world's crops are fed to animals and this is expected to increase to 40 - 50 % of global cereal production in 2050. (treehugger.com)
We have to increase cereal production by at least 50 % in the next 25 years and this will have to be on the same area of land. (sciencemediacentre.org)
However, Fischer et al. (2002b) suggest that, taking into account economic adjustment, global cereal production by 2080 falls within a 2 % boundary of the no - climate change reference production. (ipcc.ch)