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

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

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

Ozone Depletion Antarctic Ozone Hole

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

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

Ozone depleting substances

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???