Car Air Conditioners?

Hi, just out of curiosity I was wondering: How do car air conditioners work? My parents have always said something about freon, and my chemistry teacher mentioned it the other day. Yet I looked it up on the internet, and it was banned back in 1995 because it was a chlorofluorocarbon (CFC), which totally kills the ozone layer. What do they use to cool the air now? Thanks.