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Glacial Melt And Ocean Warming Drive Sea Level Upward

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The average sea level around the world has risen a total of 222 millimeters (mm) since 1875, which means an annual rate of 1.7 mm. Yet at the end of this long period, from 1993 to 2009, the sea level rose 3.0 mm per year—a much faster rate. An estimated 30 percent of the sea level increase since 1993 is a result of warmer ocean temperatures that cause the water to expand (thermal expansion). Another 55 percent of the increase results from the melting of land-based ice, mainly from glaciers and the Greenland and Antarctic ice sheets.

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Glacial Melt And Ocean Warming Drive Sea Level Upward

Submitted by glenshewchuck on
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The average sea level around the world has risen a total of 222 millimeters (mm) since 1875, which means an annual rate of 1.7 mm.1 (See Figure 1.) Yet at the end of this long period, from 1993 to 2009, the sea level rose 3.0 mm per year—a much faster rate.2 An estimated 30 percent of the sea level increase since 1993 is a result of warmer ocean temperatures that cause the water to expand (thermal expansion).3 Another 55 percent of the increase results from the melting of land-based ice, mainly from glaciers and the Greenland and Antarctic ice sheets.4 (Sea ice that melts does not contribute t

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More Than One Out Of Three U.S. Counties Face Water Shortages Due To Climate Change

Submitted by glenshewchuck on
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Greatest Risks Seen in 14 States: AZ, AR, CA, CO, FL, ID, KS, MS, MT, NE, NV, NM, OK and TX;WASHINGTON (July 20, 2010) -- More than 1,100 U.S. counties -- a full one-third of all counties in the lower 48 states -- now face higher risks of water shortages by mid-century as the result of global warming, and more than 400 of these counties will be at extremely high risk for water shortages, based on estimates from a new report by Tetra Tech for the Natural Resources Defense Council (NRDC).

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Near-Term Emissions Choices Could Lock In Climate Changes For Centuries To Millennia; Report Estimates Impacts From Various Levels Of Warming

Submitted by glenshewchuck on
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WASHINGTON — Choices made now about carbon dioxide emissions reductions will affect climate change impacts experienced not just over the next few decades but also in coming centuries and millennia, says a new report from the National Research Council. Because CO2 in the atmosphere is long lived, it can effectively lock the Earth and future generations into a range of impacts, some of which could become very severe.

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