One of the easiest ways to improve soil health and help carbon sequestration in the soil is to use wood chips as ground cover. http://articles.mercola.com/sites/articles/archive/2014/08/24/soil-health-carbon-sequestration.aspx
CARBON SEQUESTRATION. This shows how the process of carbon sequestration happens. "Underground injection and geologic sequestration (also referred to as storage) of the CO2 into deep underground rock formations. These formations are often a mile or more beneath the surface and consist of porous rock that holds the CO2. Overlying these formations are impermeable, non-porous layers of rock that trap the CO2 and prevent it from migrating upward."