It ends up that some replacement coolants for ozone in air conditioners mandated under the Montreal Protocol to address the ozone layer hole are in fact greenhouse gases themselves and contribute to global warming:

"When more than two dozen countries undertook in 1989 to fix the ozone hole over Antarctica, they began replacing chloroflourocarbons in refrigerators, air conditioners and hair spray. But they had little idea that using other gases that contain chlorine or fluorine instead also would contribute greatly to global warming."

There has also been some reasonably good news in recent weeks that latest measurements indicate the ozone hole will repair itself though taking somewhat longer than previously expected.