Carbon sequestering is tricky business. As carbon dioxide, it has a tendency to mix with all the other air, making it incredibly hard to keep under control. Keeping it capped is an expensive proposition. Not anymore, says Discovery news.
Carbon dioxide sublimates far earlier than nitrogen or oxygen liquefies, temperature wise. So just chilling out emissions separates the carbon, which can be quickly buried before it evaporates again. A refrigerator would be too expensive, though. The new method is to use rockets to cool the emissions, shoot off the nitrogen, oxygen, and other useful gasses, and then grab the dry ice before the next batch arrives.
The company that invented this technique estimates that this will reduce the cost of sequestering to a little less than half it's current costs, which responsible businesses should approve of.