How big of a problem are rising sea levels?

If you thought rising tides spelled certain doom for islanders across the globe, though, think again. A new study by the University of Auckland finds that over the course of 60 years, 80 percent of tracked Pacific islands actually stayed the same size — or even grew — despite an average annual sea-level rise of two millimeters. Out of the 27 islands the researchers examined, only four showed signs of shrinkage. How have these islands adapted to sea-level changes? With coral