The south polar continent will likely be the scene of glaciers' last stand. Antarctica has hundreds upon hundreds of named glaciers (more than six dozen of them, jockeying for pole position, were given monikers beginning with A) — tidewater glaciers, outlet glaciers, valley glaciers, cirque glaciers and the ice streams that drain the continent. Many of the tidewater glaciers are structurally supported by ice sheets, some of which have begun to break up in spectacular fashion. What happens if the 750,000-square-mile West Antarctic Ice Sheet goes away in the coming centuries, as predicted? Picture New York City permanently besieged by waters at the level of Hurricane Sandy's storm surge. Or higher