Reuters: The amount of sea ice around Antarctica has grown in recent Septembers in what could be an unusual side effect of global warming, scientists said yesterday. In the southern hemisphere winter, when emperor penguins huddle together against the cold, ice on the sea around Antarctica has been increasing since the late 1970s, perhaps because climate change means shifts in winds, sea currents, or snowfall. At the other end of the planet, Arctic sea ice is now close to matching a …