New York should prepare for 15-metre storm surges by 2300. Much worse is yet to come. Climate change will bring good news and really bad news for New York City. The good news is that hurricanes might be more likely to miss the city over the next three centuries. This means the future risk of big storm surges, relative to local sea level, could be lower than today. However, the really bad news is that if we don’t slash greenhouse gas emissions, local sea level will rise by a huge 13 metres or more. With this factored in, New York could be facing storm surges at least 15 metres above the current sea level by 2300 (PNAS, doi.org/cfgw).

“Sea level rise itself is a very big hazard, before you start to look at tropical cyclones,” says Andra Garner of Rutgers University in New Jersey. Garner’s team used climate models to simulate the paths of future hurricanes and the storm surges they will produce. These were combined with estimates of sea level rise. They conclude that 2.3-metre floods, which happened in New York on average once in 500 years before 1800, struck roughly every 25 years from 1970 to 2005, will probably hit every five years by 2030 to 2045. If we don’t cut emissions, local sea level could permanently rise by 2.3 metres before the century ends. What’s more, meteorologist Jeff Masters of Weather Underground says the good news part could be wrong: at least one study shows climate change will make hurricanes more likely to hit the north-east US. (New Scientist)

London long ago built a flood barrage downstream from the city. It was contraversial at the time, but the flood gates have already been used, and will be used more often as sea levels rise. If Europe can protect against flooding why hasn’t something similar been done in New York, where seaside houses, damaged by hurricane Sandy have been renovated, when these same residential neighborhoods should have been relocated inland? These people who now enjoy nice sea views will only have further flooding disasters to look forward to. Conclusion: don’t threaten your ataraxia by moving to the seaside a house on a hill is the smart thing to look for.