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The soil carbon pool plays an important role in the global carbon cycle. One of the alternatives suggested for addressing climate change (McKinsey and Company, 2009) is the sequestration of carbon in agricultural soils. 1 The expansion of agriculture and modern agricultural practices has contributed to the release of soil carbon into the atmosphere. 2 While it is estimated that much of these losses can be resequestered, carbon soil dynamics are complex and the amount of carbon that can actually be sequestered depends on the practices implemented, crop rotation, soil type, soil drainage, topography, and climate. Nonetheless, the potential to sequester carbon in agricultural soils has spurred a precipitous increase in public and private interest in markets that pay farmers to sequester carbon in their soils as a means of mitigating climate change. Proponents of these programs posit agricultural soil carbon …