A new study in the journal Nature says most sea level rise research may have underestimated coastal water heights by an average of 1 foot or about 30 centimeters. The discrepancy stems from widespread reliance on gravitational models that account for Earth’s gravity and rotation but overlook local drivers of sea level including tides, currents and wind. Correcting this suggests a 1-meter or 3-foot rise could inundate up to 37% more land and threaten as many as 132 million more people. And that has major implications for climate adaption planning and finance. The findings come as a new UNESCO report warns that major gaps in understanding how much carbon the ocean absorbs are also skewing global climate projections.
