The Stockholm Resilience Centre has concluded that the number of “planetary boundaries” we are crossing has increased from three in 2009, when the Centre’s researchers first introduced the concept, to six in 2023. Crossing these boundaries means humans are changing basic attributes of planetary systems to the point of risking the future of civilization.

A number of facilities intended for permanent sequestration of carbon dioxide are being developed in the United States. Several will be located on or near the coast of the Gulf of Mexico, making them easily accessible to ships. Meanwhile, in Europe there is substantial interest in capturing carbon dioxide from industrial operations, but currently inadequate sequestration facilities, and growing interest in shipping carbon dioxide for sequestration in the United States. This Article reviews the main U.S.