Lecture 36 - Lecture 36 Global Air Pollution Two of the...

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Lecture 36 Global Air Pollution Two of the most immediate global environmental threats human face are; o Increased UV radiation due to ozone depletion o Climate change due to greenhouse effect Both are caused by the introduction of large quantities of human-produced gases into the atmosphere Ozone in Nature Ground level O3 is an air pollutant o Strong irritant to lungs o Inhibits photosynthesis in plants o Photochemical smog O3 also occurs naturally in the stratosphere The Ozone Layer Formed when high-energy ultraviolet radiation splits apart normal oxygen (O2) Figure 17-1 Creates temperature inversion in the stratosphere Shields the Earth from receiving too much biologically damaging ultraviolet radiation (UV-B) Effects of UV Radiation A small amount of UV radiation is healthy for humans and other organisms Increased UV-B radiation can cause several problems: o Increases in skin cancer rates (melanoma) o o Suppression of the human immune-system o Widespread ecosystem damage
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Lecture 36 - Lecture 36 Global Air Pollution Two of the...

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