Air conditioning eventually reach the upper atmosphere. Once the refrigerant reaches the stratosphere, UV radiation from the Sun homolytically cleaves the chlorine-carbon bond, yielding a chlorine radical. These chlorine radicals catalyze the breakdown of ozone into diatomic oxygen, depleting the ozone layer that shields the Earth's surface from strong UV radiation. Each chlorine radical remains active as a catalyst until it binds with another radical, forming a stable molecule and quenching the chain reaction. Prior to 1994, most automotive air conditioning systems used R-12 as a refrigerant. It was replaced with R-134a refrigerant, which has no ozone depletion potential. Old R-12 systems
Earth Radiation Budget Satellite installed on the International Space Station in 2017. The SAGE II instrument experienced a failure in July 2000. SAGE II was unable to lock on to either sunrise or sunset events. This was believed to be due to excessively noisy azimuth potentiometer readings in selected azimuth regions. An operational work-around was developed which allowed SAGE II to collect approximately 50 percent of the nominal science data. SAGE-II was powered off in August 2005 in preparation for decommissioning. Earth Radiation Budget Satellite The Earth Radiation Budget Satellite (ERBS) was a NASA scientific research satellite within NASA's ERBE (Earth Radiation Budget Experiment)