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Effects of Climate Change

Effects of Climate Change. Global Climate Change. Sunlight. 2 Fundamental Questions Is the climate on earth changing? If so, are humans causing the change?. Some heat escapes into space. Some heat escapes into space. Greenhouse gases trap some heat. Greenhouse gases trap some heat.

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Effects of Climate Change

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  1. Effects of Climate Change

  2. Global Climate Change Sunlight 2 Fundamental Questions • Is the climate on earth changing? • If so, are humans causing the change? Some heat escapes into space Some heat escapes into space Greenhouse gases trap some heat Greenhouse gases trap some heat Atmosphere Earth’s Surface

  3. Evidence for Climate Change • Melting sea ice – Antarctic Video In a N.Y Times article (Nov. 17, 1999) it was reported that scientists have discovered that from 1993 through 1997 average Arctic sea ice thickness was six feet. This represents a significant reduction in Arctic sea ice from 1958 through 1976 when average thickness measured 10 feet. This means that in less than 30 years, there has been a 40% loss of arctic sea ice.  In a Washington Post  article (Dec. 3, 1999) it was noted that in the Arctic,  sea ice is shrinking at a rate of 14,000 square miles annually, an area larger than Maryland and Delaware combined.

  4. Evidence for Climate Change • Rising sea levels

  5. Evidence for Climate Change • Disappearing Glaciers • Greenland • Mount Kilimanjaro • Science Dept – Before/After Pics Agassiz Glacier (near Boulder Pass, Glacier National Park) 1913/2005

  6. Evidence for Climate Change • Coral Reef Bleaching

  7. Evidence for Climate Change • Temperature Increases The total global temperature increase from the 1850s throught to 2005 is 0.76°C (1.36°F) and the rate of warming averaged over the last 50 years is nearly twice that for the last 100 years.

  8. Evidence for Climate Change • CO2 Increases

  9. Evidence for Climate Change • Methane Gas Increases Levels of atmospheric methane, a powerful greenhouse gas, have risen 145% in the last 100 years.  Methane is derived from sources such as rice paddies, bovine flatulence, bacteria in bogs and fossil fuel production. 

  10. Can we know for sure if climate change is due entirely to human impact? Do you think our answer to that question should ultimately determine the actions we take?

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