In developing countries , ifpri found , irrigated wheat in 2050 would yield 34 % less than in 2000 , using ncar data ; and 28 % less going by csiro figures .
To take account of the differences ifpri fed both forecasts into its own computer , which describes how every agricultural region and , in some places , practically every farm , responds to changes in temperature and rainfall .
Another new report , this one from ifpri , looks at how food policy is changing in response to higher food prices and the nutritional problems associated with them .
When the international food policy research institute ( ifpri ) tried to work out the impacts of climate change on the main cereal crops , almost all its results suggested that yields in 2050 are likely to be lower than they were in 2000 , sometimes much lower .
But south asia , the world 's most heavily populated region , looks vulnerable : ifpri forecasts a possible 50 % fall in its wheat yield in 2050 ( one-sixth of all the world 's wheat grows on the north indian plain ) .
