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Bellringer

Explore the impact of global warming on climate, ecosystems, and human populations. Learn about greenhouse gases, their sources, and the consequences of global warming. Discover ways to reduce the risk and mitigate the effects of climate change.

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Bellringer

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  1. Bellringer • Do you think average seasonal temperatures have changed in the past few years? • How do you think recent temperatures may compare with temperatures from thousands of millions of years ago? • How might climate change affect ecosystems and human populations?

  2. Global WarmingSection 13.3 Objectives: Identify major greenhouse gases and their sources. Describe consequences of global warming.

  3. The Greenhouse Effect • Greenhouse gases: • Gases in the atmosphere that absorb and radiate heat • Water vapor, carbon dioxide, CFC’s, methane, and nitrous oxide • The solar radiation trapped serves to warm Earth’s atmosphere

  4. Atmospheric Carbon Dioxide Levels

  5. Major Greenhouse Gases and Their Sources

  6. How Certain is Global Warming? • Global warming: the predicted increase in global temperature • Some scientists believe the increasing greenhouse gases in the atmosphere will trap more heat, raising global temperatures. • Other scientists believe the warming is part of natural climatic variability.

  7. Consequences of Global Warming Spider Map Assignment • Pages 342-344 • Include ALL 5 Red Headings on the legs. • Include details of each heading.

  8. Reducing the Risk • Kyoto Protocol: requires developed countries to decrease emissions of carbon dioxide and other greenhouse gases by an average of 5% below their 1990 levels by 2012 • 2001 – U.S. decided not to ratify the Kyoto Protocol • Reforestation projects decrease carbon dioxide levels.

  9. Know for Test! • What greenhouse gas increased significantly after the Industrial Revolution? WHY? • Is global warming definitely happening? • Why would reforestation projects help reduce carbon dioxide levels? • P.345: 1, 4

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