The USA’s east coast is experiencing three to four times higher rising sea levels than the global average. It was only fairly recently that scientists discovered that ice has a gravity that pulls water towards it. When ice melts it contributes to the already rising sealevel. Because Western Greenland’s glaciers and icecap are melting quickly, the east coast of the USA experiences this sharp increase. Thirty-nine percent of the US population lives in coastal areas and generates half of the US GDP. If nothing is done, the US economy will be affected on a scale never seen before.
Miami is currently the most endangered city, built on very low, mostly swamp land. What makes the city most vulnerable is the fact that it is built on limestone. Many engineers have worked on a masterplan to protect the city, but so far all of them concluded that it is not possible. Limestone is porous, so whatever you build on it, water will seep through. It is believed that the Miami beach and bay area should be evacuated by 2060. Nevertheless, 32 condo towers are planned for construction on Miami Beach. In November 2013 Miami established a task force on sea level rise which is looking into the issue.
Boston, on the contrary, has been aware of the situation for a longer time. Nevertheless the downtown area, financial district and the waterfront are at serious risk. Each winter the coastline north and south of Boston are more and more affected by ever more severe winter storms. In combination with rising sea levels, the coast and beaches are eroding faster than ever.