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[[Coal]], [[Oil as an energy source|oil]], and [[natural gas]] currently supply about 85% of the world's [[energy]] needs. Moreover, given the relatively low cost and abundance of [[fossil fuel]]s together with the huge sunken investment in fossil-fuel-based infrastructure, fossil fuels will likely continue to be used for at least the next 25 to 50 years. The burning of fossil fuels is, however, the major source of anthropogenic (man-made) carbon dioxide (CO₂). Carbon dioxide is the main greenhouse gas released to the atmosphere.<ref name=IPCC_2005 />

[[Coal]], [[Oil as an energy source|oil]], and [[natural gas]] currently supply about 85% of the world's [[energy]] needs. Moreover, given the relatively low cost and abundance of [[fossil fuel]]s together with the huge sunken investment in fossil-fuel-based infrastructure, fossil fuels will likely continue to be used for at least the next 25 to 50 years. The burning of fossil fuels is, however, the major source of anthropogenic (man-made) carbon dioxide (CO₂). Carbon dioxide is the main greenhouse gas released to the atmosphere.<ref name=IPCC_2005 />

Geosequestration, also known as carbon capture and storage (CCS), is a means to reduce anthropogenic CO₂ emissions to the atmosphere. Geosequestration involves the long-term storage of captured CO₂ emissions in deep subsurface geological reservoirs. Carbon sequestration can be pursued as part of a portfolio of greenhouse gas abatement options, when this portfolio also includes improving the conservation and efficiency of energy use and utilizing nonfossil energy forms such as renewable ([[Solar energy|solar]], [[wind]], and [[tidal]]) and [[Nuclear power|nuclear energy]].<ref name=Kaldi_2005>Kaldi, J. G., 2005, Geosequestration: Australian Institute of Geoscientists Quarterly Newsletter, v. 80, p. 1–6.</ref> Geosequestration may contribute significant reductions to anthropogenic CO₂ emissions. Estimates by the Intergovernmental Panel on Climate Change indicate that a technical potential of at least about 2000 billion metric tonnes of CO₂ storage capacity in geological formations likely exists (Table 1).<ref name=IPCC_2005 />

Geosequestration, also known as carbon capture and storage (CCS), is a means to reduce anthropogenic CO₂ emissions to the atmosphere. Geosequestration involves the long-term storage of captured CO₂ emissions in deep subsurface geological [[reservoir]]s. Carbon sequestration can be pursued as part of a portfolio of [[greenhouse gas]] abatement options, when this portfolio also includes improving the conservation and efficiency of energy use and utilizing nonfossil energy forms such as renewable ([[Solar energy|solar]], [[wind]], and [[tidal]]) and [[Nuclear power|nuclear energy]].<ref name=Kaldi_2005>Kaldi, J. G., 2005, Geosequestration: Australian Institute of Geoscientists Quarterly Newsletter, v. 80, p. 1–6.</ref> Geosequestration may contribute significant reductions to anthropogenic CO₂ emissions. Estimates by the Intergovernmental Panel on Climate Change indicate that a technical potential of at least about 2000 billion metric tonnes of CO₂ storage capacity in geological formations likely exists (Table 1).<ref name=IPCC_2005 />

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