The soil carbon dioxide sink.

This paper contains discussions on: (1) the relation between soil C stocks and land management; (2) the relation between croplands and CO2 fluxes; (3) the potential to reduce soil CO2 fluxes and to store C in soils; (4) soil C sequestration options; (5) the political context of soil C sequestration; (6) the duration of soil C sequestration and permanence of soil C sinks; (7) the role of soil C sequestration in climate mitigation over the next century; and (8) how best to implement soil C sequestration options.