Carbon capture and storage could be a very lucrative market opportunity for oil companies.Carbon dioxide emissions are a big problem for the environment. Oil and gas combustion is a key source of this climate-changing gas. Because of that, many energy companies are looking for ways to be part of the solution instead of only contributing to the problem. That's leading big oil giants Chevron (CVX 1.30%) and ExxonMobil (XOM 1.39%) to explore the potential of carbon capture and storage (CCS). They believe CCS w ...