The document discusses ozone depletion, its causes, effects, and potential solutions. It defines the ozone layer and depletion, noting a large hole observed over the poles. The worst affected region is Antarctica, where ozone levels have dropped over 50% since 1975. Main causes of depletion include chlorofluorocarbons (CFCs), sulfur, and stratospheric clouds containing chlorine and bromine. Depletion leads to increased UV rays and consequences like higher skin cancer rates, reduced crop yields, and damage to planktons and eyes. Suggested solutions include phasing out pollutants, international cooperation, and destroying CFCs.

1. Ozone Depletion By Clarisse, Suleyman and Suzy

2. Table of Content Defining Ozone Depletion The Worst Effected Region Main Causes Why and How Ozone Depletion Happens Consequences Few Diagrams Explaining the Consequences Suggested Solutions

3. Defining Ozone Depletion Ozone Layer: - protects the earth from ultraviolet rays part of the earth’s atmosphere contains high concentration of Ozone (O3) concentration of O3 is small important to life Ozone Depletion: - large hole in the protection of the earth (ozone) - observed loss of ozone (over 50 years) - mainly above the northern and southern poles - more ultraviolet rays hitting/affecting earth - Man made substances

4. The Worst Hit Due to Ozone Depletion Where? Antarctica (worst hit). What? Ozone layers have dropped to 33% since 1975 Over 50% is destroyed Great shock Why/How? Polar regions have larger variation in sunlight Extremely low temperatures and Antarctic conditions Cloud formation cause crystals Crystals cause many reactions to occur

5. Main Causes What? Cosmic Rays Sulphur put into the atmosphere Stratospheric clouds together with Chlorine, Bromine and nitrogen oxides Chlorofluorocarbons (CFC’s) Stratospheric clouds

6. Why?How? Cosmic Rays: Different types of rays Rays react differently towards ozone Not guaranteed as the cause Sulphur: Scientist still testing Might not be the cause Stratospheric Clouds: Part of ozone layer Support chemical reactions such as chlorine Chlorine is a catalyst for ozone depletion Stops the nitric acid from forming the cloud Chlorofluorocarbons: Compounds of chlorine, carbon and fluorine Used as propellants Unreactive Remain in atmosphere for long time

7. Consequences Leading to Health Concerns 10% loss in ozone, becomes 26% increase in skin cancer e.g. malignant melanoma- (skin cancer) e.g.2 Basal and Squamous Cell Carcinomas (skin cancer) Reduces resistance to disease Reduction in food products- damage plant tissues + destroys crops Increase in eye disorders + cataracts Decrease in plankton

8. A diagram of how ozone depletion affects the rest of our world.

9. Important Solutions to Minimize Ozone Depletion Suggestions: Use less chemicals, phase out pollution Work together to reduce rate of depletion Add ozone to stratosphere Destroy CFC’s