Post and Courier: South Carolina is generating more hot air than ever. Fueled largely by gases from coal-fired power plants and vehicles, the state has increased its carbon dioxide emissions, the main contributor to global warming, by 45 percent since 1990, a Post and Courier analysis shows. Expansion of coal plants in South Carolina, such as Santee Cooper’s massive complex in Cross, helped drive the state’s 45-percent increase in carbon dioxide emissions since 1990. By some measures, only two …