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The contribution of agricultural lime to carbon dioxide emissions in the United States: dissolution, transport, and net emissions

Agricultural lime (aglime) is commonly applied to soils in the eastern U.S. to increase soil pH. Aglime includes crushed limestone (CaCO3) and crushed dolomite (MgCa(CO3)2). Following the supposition by the Intergovernmental Panel on Climate Change (IPCC) that all C in aglime is eventually released as CO2 to the atmosphere, the U.S. EPA estimated that 9 Tg (Teragram = 1012 g = 106 metric tonne) CO2 was emitted from an approximate 20 Tg of applied aglime in 2001. A review of historic data on aglime production and use indicates that 30 Tg may better represent the annual U.S. consumption of aglime. More importantly, our review of terrestrial and ocean C ...