Summary

	Mineral Mines	Deep Ocean	Mid Ocean	Aquifers	Depleted Oil and Gas Reserves	Coal Beds
Capacity	several thousand gigatons	several thousand gigatons	several thousand gigatons	several thousand gigatons	932 Gt CO₂	150 Gt CO₂
Length of time Sequestered	Permanent	Thousand years	300 years	Thousands-millions of years	Thousands-millions of years	Forever (or until coal bed is mined)
Cost	$15-20 per ton	Uncertain	Uncertain	Uncertain	Low-Value added	Low- Value added
Location	All continents	70% Earth's surface	70% Earth's surface	All continents	Mostly North America	All continents
Transport Issues	No transport-ation	Pipelines from coastal emissions sites	Pipelines from coastal emissions sites	Better for land locked countries	Close to emissions sites	Close to emissions sites
Advantage	No possibility of leakage Environmentally benign products	Large capacity, less environmental impact than mid ocean	Large capacity	Large capacity	Proven security	Improved recovery of CH₄

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