A new study has identified New York and New Orleans as among the most flood-prone cities in the US. The study reportedly found that millions of Americans, particularly those on the Atlantic and Gulf coasts, are at high risk of flooding, with some outlets suggesting that up to 17 million people may be affected. The specific number of cities and people at risk, as well as the potential consequences, are outlined in various reports, but the general consensus is that the flood risk is significant.