Banning R12 was just a political thing. Actually, R12 released (leaked) into the environment had less than a 1% effect on the ozone layer. Just like global warming. There HAS NOT been an increase in the average earth temp. for the past 12 years. Regionally, you will always see temp. variations but none globally. In addition to that, there has been very little sun spot activity for the past 12 years - a phenomena thought to be related to a cooling off process for the earth. Time will tell.