Discovery: One of the confusing things about global warming is how inconsistent it is. While the Arctic is melting quickly, for example, sea ice has been steadily growing around Antarctica. To explain this puzzling trend, a new study suggests that the ozone hole has changed wind and storm patterns enough to boost the ice pack around the majority of Antarctica. As the hole recovers, however, the scientists expect one-third of Antarctica’s sea ice to disappear. It is a complicated and still …