We compiled a literature database of permeability for three gases -CO 2 , N 2 , and O 2 -in a variety of polymers at a temperature range of 300-330 K. The number of data points for each gas is different due to the availability of data in the literature, so we only considered polymers that have permeability measurements for all three gasses. This resulted in 780 different polymers in our library, which represent a sizable portion of the polymers that are typically included in the most up-to-date Robeson plots. The selectivity versus permeability data for CO 2 /N 2 and CO 2 /O 2 are shown in Figure . We see that there are only three polymers that are above the CO 2 /N 2 Robeson upper bound . These polymers have a benzene ring and ether oxygen functional groups in common, which are known to be favorable for CO 2 separation. There are more than ten polymers that are above the CO 2 /O 2 upper bound as shown in Figure . The list of all polymers in our library and permeability measurements are provided in the SI.