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Ozone Layer O 3 Absorbs the sun’s UV radiation Stratosphere 20-50km above the Earth’s surface.

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Presentation on theme: "Ozone Layer O 3 Absorbs the sun’s UV radiation Stratosphere 20-50km above the Earth’s surface."— Presentation transcript:

1 Ozone Layer O 3 Absorbs the sun’s UV radiation Stratosphere 20-50km above the Earth’s surface

2 Ultraviolet Radiation Good: Causes Vitamin D production in humans Bad: Causes skin cancer, cataracts, and mutations, blindness, sunburn.  Severe crop damage  Destroy microorganisms at bottom of food chain

3 Ozone Depletion Antarctic Ozone Hole http://ozonewatch.gsfc.nasa.gov/

4 The Chemistry CFC’s = Chlorofluorocarbons CFC’s in UV radiation release a Cl Cl + O 3  ClO + O 2 ClO + O  Cl + O 2 IT’S A CYCLE!!! US Banned CFC’s in many products in 1978

5 Montreal Protocol Complete Phaseout of CFC’s by 1996 Good Example of countries coming together for the benefit of the environment

6 Ozone depleting substances

7 Question: What does the hole in the ozone layer mean for us? What can we do to protect ourselves from UV radiation? GRAPH: How has the Antarctic Ozone Hole Changed over time???


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