New study reveals underestimated sea level rise threatens millions more people

New research suggests most sea level rise studies have underestimated coastal water heights, potentially putting millions more people at risk. A study in Nature found that about 90% of research underestimated baseline coastal water heights by an average of 1 foot, a discrepancy more common in the Global South. This is due to a mismatch in how land and sea altitudes are measured. This underestimation could mean that by the end of the century, higher sea levels might inundate 37% more land and threaten up to 132 million more people than previously thought.