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Anthropogenic Climate Change

Anthropogenic Climate Change. SNC2D0. Climate Change. We have seen the historical changes to climate Let’s look at the modern day changes to climate Throughout the 20 th century our global climate has been changing Much of these changes are attributed to human activities

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Anthropogenic Climate Change

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  1. Anthropogenic Climate Change SNC2D0

  2. Climate Change • We have seen the historical changes to climate • Let’s look at the modern day changes to climate • Throughout the 20th century our global climate has been changing • Much of these changes are attributed to human activities • Anthropogenic (caused by humans) • Eg: Air pollution

  3. Global Temperature • The average global temperature has steadily been rising • Since the industrial age

  4. Effects of Global Warming • This warming trend has several effects • Melting of the polar ice caps • Longer summer at the poles • Rising sea levels • Increased frequency and severity of floods, hurricanes, and tornados • Extinction and endangerment of several species • Increased CO2 concentrations

  5. Polar Ice Caps • As global temperature rises, the sea and land ice at the poles melts • Less freezes in the winter • This leads to • Rising ocean levels • Decreased habitat for polar animals (ie: polar bears) • Increased warming of the planet (albedo effect)

  6. Arctic Sea Ice 2007 1980

  7. Rising Sea Levels • Rising sea levels can cause floods in low elevation places • The sea level has constantly been rising in recent years • Part of the rise in sea level is due to thermal expansion • As the planet warms, the water volume increases in the Oceans

  8. Carbon Dioxide • Increased temperature causes CO2 to be released from carbon sinks • Less CO2 stays dissolved in the oceans at higher temp. • CO2 trapped in ice and permafrost can be released when it melts • Since carbon dioxide is a greenhouse gas, this sets up a positive feedback loop

  9. CO2 Feedback Loop

  10. Carbon Dioxide Levels • In recent years, CO2 concentrations have risen to levels higher than ever before

  11. CO2 Will Keep Rising

  12. Anthropogenic Sources of GHG • Human activities have caused several greenhouse gases to increase in concentration

  13. Carbon Dioxide • Burning fossil fuels • Heating (natural gas) • Energy generation (incinerators, coal) • Transportation (gasoline) • Deforestation • Kills trees that can store carbon (photosynthesis) • Dead trees decompose

  14. Methane • Agriculture • Animal digestion (cows, pigs, chickens, etc...) • Landfills and Sewage • Decay of organic material in landfills and sewage • Mining • Releases methane from the ground • Released from all sorts of mines (coal, gasoline, etc...)

  15. How do we respond? • What are some ways that we can address the issue of anthropogenic climate change; • Globally • Provincially • Locally

  16. Homework • Pg 378 #1 – 7 • Pg 389 #1 – 6

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