Captured carbon dioxide can be used for different purposes. food and beverage companies use 4 million metric tons (mmt) of carbon dioxide per year, which is 6% of all captured carbon dioxide. enhanced oil and natural gas recovery uses 88% of all captured carbon dioxide. create a formula where x = the amount of carbon dioxide used for enhanced oil and natural gas recovery. solve for x. the amount of co2 used for enhanced oil and natural gas recovery is mmt.