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AIM: SWBAT explain how human alterations of the carbon cycle affect the global climate

AIM: SWBAT explain how human alterations of the carbon cycle affect the global climate. Please Do Now: 1) What organisms are responsible for taking Nitrogen out of the atmosphere and making it usable for plants? 2) What is the process by which Nitrogen returns to the atmosphere?. Agenda.

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AIM: SWBAT explain how human alterations of the carbon cycle affect the global climate

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  1. AIM: SWBAT explain how human alterations of the carbon cycle affect the global climate Please Do Now: 1) What organisms are responsible for taking Nitrogen out of the atmosphere and making it usable for plants? 2) What is the process by which Nitrogen returns to the atmosphere?

  2. Agenda • Do Now • Nitrogen Cycle Details • Global Warming Notes • Reading/Annotation • “Inconvenient Truth” Clip

  3. What happens after Nitrogen is fixed? • N2 gets turned into NH4 (ammonium) by nitrogen fixing bacteria • Most plants can’t use this either • Nitrifying bacteria turn that ammonium into nitrite and nitrate, which plants can take up

  4. What happens after Nitrogen is fixed? • Plants taking up inorganic Nitrogen (nitrates) and incorporating it into their tissues is called assimilation • Assimilated N is cycled through living things (plants, animals that eat them) until decomposers (fungi and some kind of bacteria) turn it back into ammonia (ammonification)

  5. What happens after Nitrogen is fixed? • The ammonium gets nitrified and assimilated again and again, unless denitrifying bacteria return it to the atmosphere as N2

  6. Overview

  7. What are Greenhouse Gases? • Gases that it absorb some of the sun’s energy that hits the earth and traps it • There are other greenhouse gases: methane, ozone, CFCs

  8. How are Fossil Fuels involved in this? • When humans burn fossil fuels, CO2 is released into the atmosphere

  9. Human Consumption of Fossil Fuels • In the last 100 years, the number of fossil fuels burned has increased astronomically • More people (7+ billion) each using more energy

  10. Has this translated into “Global Warming”? • The earth is getting warmer, on average, though not uniformly • 1.4 degrees so far • This is not debated at all anymore

  11. What will happen exactly? • We do not know exactly • How hot will it get?(2100 2.4 to 6.4 degrees) • The ice sheets are melting (well documented) • How much will ocean levels rise?

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