Frequent and severe flooding could slam New York City and other coastal areas in the future if carbon emissions are not cut, according to new research. A report titled "Amplification of flood frequencies with local sea level rise and emerging flood regimes," published by researchers from Princeton and Rutgers universities, concluded that without slashing greenhouse gas emissions, the average risk of a 100-year flood will increase 40-fold by 2050 across U.S. coastlines.