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Global Changes in the Atmosphere

msnbcmedia.msn.com/j/msnbc/Components/Photos/. Global Changes in the Atmosphere. Global Warming and Ozone Depletion. Global Warming. Over the last 120 years , the average temperature of the troposphere( the layer of the atmosphere closest to Earth) has risen by 0.5 ° Celsius

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Global Changes in the Atmosphere

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  1. msnbcmedia.msn.com/j/msnbc/Components/Photos/... Global Changes in the Atmosphere Global Warming and Ozone Depletion

  2. Global Warming • Over the last 120 years , the average temperature of the troposphere( the layer of the atmosphere closest to Earth) has risen by 0.5° Celsius • Global Warming is the gradual increase in the temperature of Earth’s atmosphere • The Greenhouse Effect is a natural process by which heat is trapped in the atmosphere by water vapor, carbon dioxide, methane and other gases that form a “blanket” around the Earth.

  3. Global Warming • The gases that trap solar energy are called greenhouse gases. The greenhouse effect helps life to exist on Earth. • Human activities that add greenhouse gases to the atmosphere may be warming Earth’s atmosphere. • Burning wood, coal, oil, and natural gas adds carbon dioxide to the atmosphere.

  4. Ozone Depletion • Ozone is a gas in the stratosphere, a high layer of the atmosphere, that absorbs most of the ultraviolet radiation that strikes Earth from the sun. • Chemicals produced by humans have been damaging the ozone layer, chloroflourocarbons (CFC’s) are the main cause.

  5. Ozone Depletion • A decrease of ozone in the stratosphere means more ultraviolet radiation strikes Earth’s surface, and us. Ultraviolet radiation can cause - sunburns -eye damage - skin cancer

  6. Melting Glaciers/ Ice Caps http://www.explorersweb.com/sitemedia/TSthumbs/everest/kili3.jpg www.earthman.tv/.../MeltingGlacier2.jpg http://msnbcmedia.msn.com/j/msnbc/Components/Photos/060619/060619_parks1_glacier_hlrg_9a.hlarge.jpg

  7. Melting Glaciers/ Ice Caps http://www.savebiogems.org/images/polar/map.gif

  8. http://ozonewatch.gsfc.nasa.gov/facts/images/ozone_hole.jpg

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