Recent theoretical work by Kumar and Francisco suggested that the high reactivity of Criegee intermediates (CIs) could be utilized for designing efficient carbon capture technologies. Because the anti-CH3CHOO + CO2 reaction has the lowest barrier in their study, we chose to investigate it experimentally. We probed anti-CH3CHOO with its strong UV absorption at 365 nm and measured the rate coefficient to be ≤2 × 10-17 cm3 molecule-1 s-1 at 298 K, which is consistent with our theoretical value of 2.1 × 10-17 cm3 molecule-1 s-1 at the QCISD(T)/CBS//B3LYP/6-311+G(2d,2p) level but inconsistent with their results obtained at the M06-2X/aug-cc-pVTZ level, which tends to underestimate the barrier heights. The experimental result indicates that the reaction of a Criegee intermediate with atmospheric CO2 (400 ppmv) would be inefficient (keff < 0.2 s-1) and cannot compete with other decay processes of Criegee intermediates like reactions with water vapor (∼103 s-1) or thermal decomposition (∼102 s-1).