These African heritage sites are under threat from rising seas, but there's still time to save them

On the shores of North Africa, ancient cities have stood for millennia. The columns of Carthage, in modern-day Tunisia, are a reminder of the once bustling Phoenician and Roman port, and along the coast in what's now Libya, lie the majestic ruins of Sabratha's Roman amphitheater close -- perhaps too close -- to the sea. Read Full Story