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Soil Carbon Sequestration
http://www.fao.org/ag/agl/agll/carbonsequestration/background.stm
Growing plants and their root system all contain carbon.  This figure outlines interactions of plants with the atmosphere and soils. Growing plants absorb carbon and transport it to the soil via their roots. Decaying plant material produces   carbon dioxide which is released to the atmosphere. Some remains in the soil. Large quantities have been trapped in the soil over long times. Agriculture tends to release some of it to the atmosphere.
Local scientists are already involved in trying to better understand the part of the carbon cycle related to plants interaction with our soil.
No-till farming practices are cited as one means of capturing carbon from the atmosphere and returning it to the soil. Research is underway in to better manage animal wastes. The lumber we take from forests and build into our houses is also a sink for carbon.
So far this developing science is fraught with uncertainty. How much of the organic material left on the land is incorporated in soil? How long will it stay there? How long will lumber in houses endure.
Could we modify our treatment of wastes now going to landfills and sewers to return the carbon to the soil?
Can we use our knowledge to remove carbon dioxide from the atmosphere and build soil fertility?