Sea level rise could reach six or seven feet by the year 2100.
Global mean sea level rose rapidly following the last ice age approximately 20,000 years ago. However, the rate of sea level rise slowed and has been nearly stable over the last few thousand years. Since around 1900, global average sea level has risen by about 7-8 inches (Hayhoe et al. 2018, NCA4) and the rate of sea level rise has been accelerating in recent decades as ocean temperatures warm. Nearly half of this rise in sea levels has occurred since 1993, and the rate of global mean level rise since 1993 has been approximately 3.4 mm per year. It is virtually certain that global mean sea levels will continue to rise throughout the 21st century and beyond. [...] Projections in the relative sea level rise along the contiguous U.S. coastline range from 1.96 – 7.22 ft (0.6–2.2 m) by the year 2100 and 2.62 – 12.8 ft (0.8–3.9 m) by the year 2150, relative to sea levels in 2000. However, not all areas will experience the same amount, or rate, of sea level rise due to changes in local land and ocean heights.