Scientists have been telling us for a while that sea levels are rising as a result of climate change. Then, a few weeks ago, the world got some devastating news. The oceans may be swelling much faster than we thought. One study found that if we continue to emit greenhouse gases at the current rate, a giant ice sheet in the Antarctic could crumble, to devastating effect. Children alive today may witness a sea level increase of five or six feet. That would mean environmental devastation and the disappearance of many coastal communities. What level of sea rise is now inevitable? What can we do to prepare? And what’s in store for Maryland? We speak to John Englander, oceanographer and author of “High Tide on Main Street: Rising Sea Level and the Coming Coastal Crisis”.