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Hurricanes in 2012 and 2003 submerged parking lots and park benches, and flooded businesses along Annapolis' Dock Street. City planners estimate that, given the rise in sea level, by 2100 the flood from a once-in-a-hundred-year storm would be almost twice as high as it would be if such a storm hit today. Marvin Joseph/The Washington Post/Getty Images hide caption

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Marvin Joseph/The Washington Post/Getty Images

Mapping Coastal Flood Risk Lags Behind Sea Level Rise

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NPR Battleground Map: Hillary Clinton Solidifies Lead Against Donald Trump

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A Martian gravity map shows the Tharsis volcanoes and surrounding flexure. The white areas in the center are higher-gravity regions produced by the massive Tharsis volcanoes, and the surrounding blue areas are lower-gravity regions that may be cracks in the crust (lithosphere). MIT/UMBC-CRESST/GSFC via NASA hide caption

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MIT/UMBC-CRESST/GSFC via NASA

This World Health Organization map shows the percent of the population vaccinated for measles in each country in 2013. Dark green is at least 90 percent. Light green is 80 to 89 percent. Orange is 50 to 79 percent. Red is less than 50 percent. Courtesy of WHO hide caption

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Courtesy of WHO