The reaction shown here was performed with an iridium catalyst, both in supercritical CO2 (scCO2) and in the chlorinated solvent CH2Cl2. The kinetic data for the reaction in both solvents are plotted in the graph. Why is this a good example of a green chemical reaction?

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scCO Chiral Ir-cat. Ph -N Ph 100 80 CH2C12 c 60 F.C CF 0 e 40 F. 20 Ir-catalyst 0 1 2 3 4 5 6 7 8 9 10 22 23 24 Time [h