Although external forcing factors and feedback mechanisms in the ocean-air coupling systems have been dominating the temporal and spatial variations of the Earth’s climate systems,lands (continents) have been effectively contributing to the variations through altering the energy and water balances and through participating in the biogeochemical processes.In that regard,the central Asian arid-semiarid belt is of particular interest because this inherently vulnerable ecological system has been experiencing land degradation due to severe human adverse impacts under ongoing accelerated warming climates.The projected increasing population and expanding economy,together with the observed alarming rate of global warming will further degrade lands and promote esertification,thus enhancing aerosol injection into atmosphere.The desertification and aerosol injection will: (1) alter radiation balance in aerosol source areas (absorption vs.reflection),(2) modulate precipitation in aerosol influenced areas (via providing condensation nuclei),and (3) participating in carbon cycle in the Pacific and probably beyond (via providing iron fertilizer).Further investigation into aerosol injection may well help us resolve two important climatological issues: (1) an increased aerosol in the air reduces the most important greenhouse gas (water vapor),thus decreasing the temperature,(2)aerosols transported from arid-semiarid areas provide iron to stimulate oceanic productivity that absorbs CO2 from the air and thus cools the earth.