thoughtfulman
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interesting story
Let's look at the facts. At the end of the last ice age 20,000 year ago, sea level was about 300 feet lower than present. This exposed the "land bridge" of the Aleutian Islands which allowed primitive humans to walk to North America from Asia. For about 10,000 years the global temperature rose steadily, a total of about 14°F. For the next 10,000 years, the temperature has been relatively stable, notwithstanding some minor oscillations (Roman warm period, Medieval warm period, Little Ice Age, etc.) Due to the long-term melting of snow and ice, sea level has risen steadily for 20,000 years, at an average of about 4.6 mm per year. If the average annual of rise is currently 2-3 mm per year (as the article states), then it is somewhat below average, and clearly has not been accelerate4d by man's activities or emissions.
If the average rate of sea level rise over the last 20,000 years continues, at 4.6 mm per year, by 2100 the level will be up 419 mm or about 16" naturally. This rate will likely continue until the onset of the global temperature decline preceeding the next ice ige.
Incidentally, salt water intrusion under seaside land, displacing fresh groundwater, is common. It is caused by excessive withdrawal of the groundwater, which both lowers the overlying land and also creates low pressure areas which causes the sea water to migrate underground to that area.On Rising sea salinates India's Ganges posted 9 months, 3 weeks ago 6 Responses