where has all the O3 gone

Who are the largest producers of greenhouse gasses? Students went online and researched the centers of largest greenhouse gas. Not a surprise that most were in the Northern hemisphere. Why is the O3 depletion above the South Pole? They put forth ideas such as convective atmospheric mixing and the Coriolis effect. They couldn't find a definitive answer. That really bugged them. I explained that this is ongoing research and no one had the definitive answer.

My classes in General Science are all SpEd high schoolers this year. About 50 kids. They read at @k-3rd. I took the image-j Antarctic stacks that we had downloaded and showed them to the students individually and then animated. We discussed what we had learned about the O3 layer and greenhouse gasses throughout the year. We reviewed the reasons we are concerned about the O3 depletion and the ramifications thereof. The students reviewed in their text books and researched online where the most greenhouse gasses were produced. They noted that the O3 depletion was in the opposite hemisphere. When I asked them why that would be, they came up with some theories. They asked me for a definitive answer and I told them that science hasn't come up with it yet. It seemed to bolster their scientist within to know that even the "experts" didn't have the answer to that one.