According to aggregate sources, the global average sea level rise rate is currently accelerating at approximately 4.2 to 4.6 millimeters (about 0.17 to 0.18 inches) per year.
Current Rates and Acceleration
Global Average: Rises at about 0.14 to 0.17 inches per year, more than double the average rate of the 20th century.
Total Increase: Global mean sea levels have risen 8-9 inches (21-24 cm) since 1880.
Recent Shift: Nearly half of the increase recorded since 1993 has happened in just the last two decades.
Main Causes
Melting Ice: Fresh water entering oceans from melting land-based glaciers and polar ice sheets.
Thermal Expansion: Seawater occupying more volume as ocean temperatures increase.
Local Land Motion: Sinking land (subsidence) makes relative sea level rise much faster in specific regional hotspots like the U.S. Gulf and Atlantic coasts.
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