However, common sense would dictate that the possibility certainly exists through the man-made release of carbon sequestered for millions of years.

FORBES: The Self Corruption of Climate Science

Once the energy trapped in coal is unleashed and its carbon sequestered, energy-laden hydrogen can be used directly in fuel cells.

ECONOMIST: The environment

Underground storage of the captured carbon would be regulated in the same way that carbon dioxide sequestered from power stations might be again, for the most part, a local matter.

ECONOMIST: Geoengineering