Lecture_11_Climat_change_Ozon_Depletion_Biodeversity_Final_Exam_Preparation

Lecture_11_Climat_change_Ozon_Depletion_Biodeversity_Final_Exam_Preparation

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Global Climate Change and Human Health
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The Earth’s natural green-house effect • Energy from the Sun warms the Earth’s surface • Energy radiate back toward space • Water vapor (clouds), CO 2 , and other gasses are heated • They radiate heat (longer-wavelength) in all directions (space or warms the air and the Earth’s surface)
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Green house gasses • Water vapor •C O 2 H 4 •N 2 O
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Atmospheric CO 2 level and global temperature
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Processes affecting increase of green house gases • Fossil fuels – Electricity generated by coal 42% – Transportation 24% – Industrial process 20% – Residential and commercial uses 14% • Clearing and burning forests and grass lands • Raising large number of livestock (methane) • Planting of rice • Inorganic fertilizers
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Largest emitters of CO 2 1. China and Taiwan 24.4 % 2. US 22.2% 3. European Union 14.7% 4. Russia 5.6% 5. India 4.9% 6. Japan 4.6% 7. Germany 3.1 % 8. Canada 2.3% (four times the global average)
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Present problems •2 0 th century was the hottest century in the past 1000years • Since 1861 the average global temper. of the troposphere has risen 0.7 0 C • 20 warmest years occurred since 1980 • Glaciers and floating sea ice are melting and shrinking • During the last century average sea level rose by 0.1-0.2 m
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Lecture_11_Climat_change_Ozon_Depletion_Biodeversity_Final_Exam_Preparation

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