Earthshaking possibilities may limit underground storage of carbon dioxide

Combating global warming by pumping carbon dioxide into the ground for long-term storage -- known as carbon sequestration -- could trigger small earthquakes that might breach the storage system, allowing the gas back into the atmosphere, according to a geophysicist. That hazard, combined with a need for thousands of injection sites around the globe, may keep sequestration from being feasible on a large scale.

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