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Many subtropical regions are expected to become drier due to climate change.This will lead to reduced vegetation which may in turn amplify the initial drying.Using a coupled atmosphere-ocean-land model with a dynamic vegetation component that predicts surface albedo change, here we simulate the climate change from 1901 to 2099 with CO2 and other forcings.In a standard IPCC-style simulation, the model simulated an increase in the worlds warm desert area of 2.5 million kin2 or 10% at the end of the 21st century.In a more realistic simulation where the vegetation-albedo feedback was allowed to interact, the warm desert area expands by 8.5 million km2 or 34%.This occurs mostly as an expansion of the worlds major subtropical deserts such as the Sahara, the Kalahari, the Gobi, and the Great Sandy Desert.It is suggested that vegetafion-albedo feedback should be fully included in IPCC future climate projections.