Shorelines from North Carolina to Boston are in a 'hotspot' for sea-level rise and will see water levels rise at double the rate of most places on the planet, according to the U.S. Geological Survey. The doubling is largely because of a geologic double whammy. The treasured lifestyle of residents along the coasts of the Mid-Atlantic could significantly change by the time this year's high school graduates retire, scientists say. The larger issue for taxpayers is where to spend money and energy attempting to hold back the ocean — and where to retreat and allow nature to take its course.Humans have already changed Earth's atmosphere by releasing vast amounts of carbon dioxide and similar heat-trapping gases from power plants, vehicles and other sources, scientists say. The resulting rise in air and sea-surface temperatures, along with melting glaciers and land ice, will push up sea levels globally by more than one-and-a-half feet by 2100.