Abstract: A carbon dioxide (CO2) capture system to reduce CO2 emissions comprises an absorption zone and a regeneration zone. The absorption zone captures CO2 from exhaust gas by absorption in a liquid solvent separated from the exhaust gas by a separator. The liquid solvent comprises a blend of alkali metal salts of two or more amino or amino-sulfonic acids, thereby forming a first constituent and a second constituent. The first constituent is a primary or secondary amino or amino sulfonic acid with molar mass of less than 200 g/mol. The second constituent has a molar mass of less than 300 g/mol. The regeneration zone may rejuvenate the liquid solvent rich in captured CO2 by heating so that a resulting liquid solvent with a low concentration of CO2 is pumped back to the absorption zone. An on-board CO2 capture and storage system for a mobile internal combustion engine and a method for capturing CO2 are also described.