This occurs even though simulated global agricultural production of major grain crop declines are only small to moderate under the climate change conditions tested. Evidence from Rosenzweig and Parry's study also suggests that adaptive measures by farmers in the tropical and subtropical climates will do little to reduce this disparity. By integrating past data on climate change, which were mainly regionally or nationally focused, the study sought to obtain a global picture of the changes in crop yields associated with various climate change scenarios. The study then used a world food trade model to simulate the economic consequences of these potential changes in crop yields. The analysis included the combined effects of climate change and increasing carbon dioxide on crop yields and water use.
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