Biosequestration is the capture and storage of the atmospheric greenhouse gas carbon dioxide by biological processes.
This may be by increased photosynthesis (through practices such as reforestation / preventing deforestation and genetic engineering); by enhanced soil carbon trapping in agriculture; or by the use of algal bio sequestration (see algae bioreactor) to absorb the carbon dioxide emissions from coal, oil or gas-fired electricity generation.
Biosequestration as a natural process has occurred in the past, and was responsible for the formation of the extensive coal and oil deposists which we are now burning. It is a key policy concept in the climate change mitigation debate. It does not generally refer to the sequestering of carbon dioxide in oceans (see carbon sequestration) or rock formations, depleted oil or gas reservoirs (see oil depletion and peak oil), deep saline aquifers, or deep coal seams (seecoal mining) (for all see geosequestration) or through the use of industrial chemical carbon dioxide scrubbing. Source: Wikipedia