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Global sea level rise has been assumed to have been rising at an average rate of 1.5 centimeters (0.6 inches) per decade since 1900, as measured by NOAA. However, a new study has cast that figure into doubt: after having taken regional sea level increases into account, the previously accepted rate may be off by a great deal — from 5 to 28 percent in some regions.

The problem comes from the fact that sea level measurements have been historically taken from coastal tide gauges, from roughly a dozen select sites around the northern hemisphere. It was assumed in the past that ocean levels were rising relatively evenly across the globe, however:
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With coastal areas bracing for rising sea levels, new research indicates that cutting emissions of certain pollutants can greatly slow down sea level rise this century.

A research team found that reductions in just FOUR pollutants that cycle comparatively quickly through the atmosphere could temporarily forestall the rate of sea level rise by 25 to 50%.

As glaciers and ice sheets melt and warming oceans expand, sea levels have been rising by an average of about 3 millimeters annually in recent years (just more than one-tenth of an inch). If temperatures continue to warm, sea levels are projected to rise between 7 and 23 inches this century. Some scientists, however, feel those estimates are too conservative.
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As glaciers melt and sea levels rise, threatening coastal cities, geologists are trying to predict the future by looking at what happened when sea levels rose in the past. Meanwhile, high levels of methane are showing up in the Arctic, and there’s a big danger that a huge rise of temperatures in the Arctic will destabilize huge amounts of methane currently frozen in the sea ice on the ocean floor.
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"God gave Noah the rainbow sign. No more water, the fire next time." The lyrics to this old gospel tune remind us that in Genesis, God promised not to flood the earth again (although it looks like many of us many soon be drowning), and there’s a good chance that in 50 or 100 or 200 years, coastal cities like New York City will sink beneath the sea.
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