Global warming in Antarctica

"Four months ago, scientists discovered that the “hole” created by the world’s use of ozone-depleting gases — in aerosol spray cans, aging refrigerators and old air-conditioners — had expanded again, stretching once more to the record size of 2001.

An unusually cold Antarctic winter, rather than the rise in the use of refrigerants, may have caused the sudden expansion, which covered an area larger than North America."

- NY Times story

The unusually cold winter was caused by global warming?