if the globel climate were to warm significantly as result of the green house effect or another climate changes the artic ice cap would start to melt this cap contains the equivalant of same 680,000cubic miles of water more than 200 million people live on land that is less then 3 feet above sea level in th united states several large cities have low average elevation boston 14 feet san diego 13 feet new orlands 4 feet how are these cities effected

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