From The Independent UK
By Ian Sample

Half of the world’s population could face severe food shortages by the end of the century as rising temperatures take their toll on farmers’ crops, scientists have warned.

Harvests of staple food crops such as rice and maize could fall by between 20% and 40% as a result of higher temperatures during the growing season in the tropics and subtropics. Warmer temperatures in the region are also expected to increase the risk of drought, cutting crop losses further, according to a new study.

The worst of the food shortages are expected to hit the poor, densely inhabited regions of the equatorial belt, where demand for food is already soaring because of a rapid growth in population.

A study in the US journal Science found there was a 90% chance that by the end of the century, the coolest temperatures in the tropics during the crop growing season would exceed the hottest temperatures recorded between 1900 and 2006.

More temperate regions such as Europe could expect to see previous record temperatures become the norm by 2100.

“The stress on global food production from temperatures alone is going to be huge, and that doesn’t take into account water supplies stressed by the higher temperatures,” said David Battisti, at the University of Washington, who led the study.

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