Kinder Morgan (KMI 2.60%) currently makes most of its money supporting the natural gas market (64% of its current business mix is natural gas-related). However, the company has a meaningful carbon dioxide segment (10% of its earnings). That business could grow into a much larger future contributor for the midstream giant. Fueling that view is the potentially massive opportunity for carbon capture and storage, which oil major ExxonMobil (XOM 2.54%) forecasts will grow into a $4 trillion global market by 2050 ...