Nitzan and co-workers 440 used classical molecular dynamics to simulate a model system with many CO 2 molecules coupled to a cavity mode shown in Fig. . The strong coupling is formed between the cavity mode and the C-O bond stretching mode in the CO 2 molecules. A fraction of the molecules are "hot", which are thermally activated and have higher kinetic energy. The rest CO 2 molecules are at room temperature, which are called "thermal" molecules and act like a thermal bath to dissipate excess energies from the "hot" molecules. Fig. shows that inside the cavity the fitted vibrational relaxation rates are much larger than the rates outside the cavity. This shows that polaritons can facilitate the intermolecular vibrational energy transfer between the hot CO 2 molecules and the thermal bath. This effect is especially strong at the resonant condition where the cavity frequency is close to the C-O bond stretching frequency. Fig. shows that while the total number of molecules (N sub ) is fixed, increasing the number of "hot" molecules results in faster energy dissipation both inside and outside the cavity. However, the increase of decay rate is faster inside the cavity, so the difference between the two rates increases as well, so this cavity-enhanced energy transfer depends on the Rabi splitting and scales with the number of hot molecules. Although polaritons are always transiently excited and able to mediate the energy transfer, the modification on the average relaxation rates becomes negligible when the total number of CO 2 molecules exceeds a certain number (N sub > 10 4 as reported in the work).