Why do deniers so frequently attempt to presume false dichotomies? If we spend money on A we can't spend it on B. If photons are flowing to the left they cannot be flowing to the right. If water vapor is absorbing some IR, CO2 cannot. If natural compounds are breaking down ozone, CFCs cannot.
CFCs break down ozone in a catalytic reaction. For those of you with no chemistry, that means that the CFCs act as an accelerant to the reaction but are not themselves consumed by it. It is the same way in which the few grams of platinum, palladium and rhodium in your catalytic converter enable the conversion of hundreds of thousands of cubic meters of NO, CO and hydrocarbons that pass through it.*
* 2.5 liter at 3,500 RPM consumes 2.5 * 3500/2 = 4,375 liters per minute or 4.375 m^3/min
If we drive that car 12,500 miles/year at 37.5 mph, the engine runs 333.33 hours or 20,000 minutes. That would consume 87,500 cubic meters of air/year. Has anyone here ever had to replace a catalytic converter? Didn't think so. Let's assume it functions for 8 years. That totals 700,000 cubic meters of air. A cubic meter of air masses 1.293 kg. Our total would mass 905,100 kg. The 5 gms of catalyst in the converter then represents 5.52425 PPB
