Global sea level has risen over the modern observational period.
Tide gauges and satellite measurements show a long-term rise in global mean sea level.
Show me why
Water expands as it warms, and melting land ice adds water to the ocean. Measurements from individual coastlines also reflect land motion and regional ocean behavior, so local and global sea level are not identical.
A common misconception
One coastline is not a direct stand-in for the global average.
Where the limits are
Local relative sea level can rise faster, slower or even fall when land moves.
How we know
NOAA and Smithsonian Ocean explain the historical global rise and the satellite record. Inspect the time span and reference used in a sea-level graph. A regional decline or a short interval cannot by itself establish the direction of the global long-term trend.
What would change this conclusion?
Independent corrections large enough to reverse the combined long-term record would require revision.
Sources you can inspect
- Smithsonian OceanSea Level Rise
Explains historical measurements, thermal expansion and land ice.
Publication date not stated · Checked in initial research 2026-10-08 - NOAASea Level Trends
Distinguishes local records and satellite-derived global trends.
Publication date not stated · Checked in initial research 2026-10-08
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