http://www.physorg.com/news93106592.html
Two statements above deserve emphasis.
"--Congress should remove any expectation that construction of new coal plants without carbon dioxide capture will be "grandfathered" and granted emission allowances in the event of future regulation. This is a perverse incentive to build coal plants without carbon dioxide capture today.
-- Emissions will be stabilized only through global adherence to carbon dioxide emission constraints. China and India are unlikely to adopt carbon constraints unless the United States does so and leads the way in the development of CCS technology. "
Also, worth considering that the most reliable way to sequester fossil carbon is to never dig it up in the first place. At a certain level of energy efficiency + pollution cost this becomes the "economically efficient option".