The project, run by ethanol producer Archer Daniels Midland and partners, received $281 million in taxpayer dollars via Department of Energy grants. It has stored more than 2.8 million metric tons of CO2 since 2011. However, EPA records show that represents a capture rate of only about 10-12 percent of the plant’s emissions each year at most, allowing the rest of the carbon dioxide to escape into the atmosphere. This small percentage raises questions about whether industrial-scale carbon capture technology can be a meaningful solution to global warming.