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Globalwarming effects and consequences: Hurricanes, sea-level rise

Posted on février 23rd, 2007 by Globalwarming awareness2007.
Categories: globalwarming.

Consequence: more powerful and dangerous hurricanes
Warmer water in the oceans pumps more energy into tropical storms, making them more intense and potentially more destructive.

    Globalwarming awareness2007 :

  • The number of category 4 and 5 storms has greatly increased over the past 35 years, along with ocean temperature.

    • Consequence: melting glaciers, early ice thaw
    Rising global temperatures will speed the melting of glaciers and ice caps, and cause early ice thaw on rivers and lakes.    Globalwarming awareness2007 :

    • At the current rate of retreat, all of the glaciers in Glacier National Park will be gone by 2070.
    • After existing for many millennia, the northern section of the Larsen B ice shelf in Antarctica — a section larger than the state of Rhode Island — collapsed between January and March 2002, disintegrating at a rate that astonished scientists. Since 1995 the ice shelf’s area has shrunk by 40 percent.
    • According to NASA, the polar ice cap is now melting at the alarming rate of nine percent per decade. Arctic ice thickness has decreased 40 percent since the 1960s.
    • In 82 years of record-keeping, four of the five earliest thaws on Alaska’s Tanana River were in the 1990s.

      • Consequence: sea-level rise
      Current rates of sea-level rise are expected to increase as a result both of thermal expansion of the oceans and of partial melting of mountain glaciers and the Antarctic and Greenland ice caps. Consequences include loss of coastal wetlands and barrier islands, and a greater risk of flooding in coastal communities. Low-lying areas, such as the coastal region along the Gulf of Mexico and estuaries like the Chesapeake Bay, are especially vulnerable.      Globalwarming awareness2007 :

      • The current pace of sea-level rise is three times the historical rate and appears to be accelerating.
      • Global sea level has already risen by four to eight inches in the past century. Scientists’ best estimate is that sea level will rise by an additional 19 inches by 2100, and perhaps by as much as 37 inches.

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Consequences of globalwarming on ecosystem

Posted on février 23rd, 2007 by Globalwarming awareness2007.
Categories: globalwarming.

Consequence: ecosystem shifts and species die-off
The increase in global temperatures is expected to disrupt ecosystems and result in loss of species diversity, as species that cannot adapt die off. The first comprehensive assessment of the extinction risk from global warming found that more than one million species could be committed to extinction by 2050 if global warming pollution is not curtailed. Some ecosystems, including alpine meadows in the Rocky Mountains, as well as tropical montane and mangrove forests, are likely to disappear because new warmer local climates or coastal sea level rise will not support them.

Globalwarming awareness2007 :

  • A recent study published in the prestigious journal Nature found that at least 279 species of plants and animals are already responding to global warming. Species’ geographic ranges have shifted toward the poles at an average rate of 4 miles per decade and their spring events have shifted earlier by an average of 2 days per decade.
  • In Washington’s Olympic Mountains, sub-alpine forest has invaded higher elevation alpine meadows. In Bermuda and other places, mangrove forests are being lost.
  • In areas of California, shoreline sea life is shifting northward, probably in response to warmer ocean and air temperatures.
  • Over the past 25 years, some penguin populations have shrunk by 33 percent in parts of Antarctica, due to declines in winter sea-ice habitat.

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