The efficacy of Montreal Protocol shouldn’t be measured by how much CFC was eliminated from the atmosphere, but by how much reduction in stratospheric ozone depletion was achieved.
Similarly, the efficacy of Kyoto Protocol and other similar measures shouldn’t be measured by how much CO2 was eliminated from the atmosphere, but by how much reduction in mean global temperature was achieved.
The current trend is to publicize how much reduction in CFC or CO2 was achieved without mentioning that little to no improvement in ozone depletion or global mean temperature was achieved.
That is like saying, “We didn’t cure cancer, but we reduced the amount of carcinogens in his system.”
It is the subtle switch of concerns that are used to distract the public. The goal is to solve problem, not to make people work harder.