Soil Erosion: Data Say C Sink

In the letter “Soil erosion: a carbon sink or source?” (R. Lal and D. Pimentel, 22 February, p. [1040][1]) and in its Response (K. Van Oost et al. , 22 February, p. 1042), the authors note that soil erosion is a serious threat to land health. Nevertheless, evidence points toward a carbon (C)