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Executive Summary. A range of climate-change scenarios was examined in this report. By the year 2100, New York City is expected to have as many 90-degree-plus days as Miami has today in the best case (double New York’s current levels) or almost as much as Houston in the worst-case scenario (more than six times New York’s current level s ). But the threats from global wa rming ex tend well beyond the heat. Sea – le vel rise will contribute to the tem pora ry flo o ding or perma nent in und ation of ma ny of New York City ’s and the re gion’s coastal areas as inc reased sea le vels accentuate the impact of the storms that already stri ke the re gion. Ero s ion could de va state valuable beaches and wetlands and, as has happened in the past, we can expect that homes will be swept into the ocean by storms. In 1992, a powerful nor’easter shut down New York City’s subways, trains, highways and airports, battered coastal residences and caused sub sta ntial beach ero s ion. By the 2050 s, storms with flooding of the same magnitude as the ’92 nor’easter are projected to occur from once every 18 to once every 8 years, depending on the scenario. By the year 2100, the range drops to from once every 13 years to about once per year.