1. OBJECTIVES OF TODAY’S ACTIVITY TOPIC: Feedback Loops After today’s activity, you will be able to: Identify positive and negative feedback systems Describe how feedback systems impact global climate change.

2. CASUAL PRINCIPLES 1.Gravitational energy, thermal energy, and/or chemical energy drive all movement and change of matter on Earth. 2.A system is in equilibrium when energy in the system is balanced. 3. Matter moves and changes to return a system to equilibrium. 8. Feedback loops can accelerate, decelerate, or dampen change.

3. Feedback Loops Positive feedback: a change in the system causes further changes in the system such that some component in the system increases overall. Negative feedback: a change in a system causes and opposite response in the system such that the system is closer to equilibrium. In this case, the negative feedback component will decrease the size of the changes going on in the system.

4. Background: Negative Feedback Loop http://www.bio.miami.edu/~cmallery/150/physiol/c4 4x10thermo-reg.jpg

5. Background: Positive Feedback Loop http://sitemaker.umich.edu/section2_group1/files/sec ondfeedback.jpg

6. Source: Babies Crying Target: Permafrost Imagine you have a nursery full of sleeping babies. One baby starts crying because they are hungry. This wakes up the other babies and they start crying too. The nurse comes in and quiets the first baby. When that baby calms down, the others stop crying and go back to sleep. Babies CryingPermafrost in the Arctic Baby is hungry and starts crying Other babies wake up Other babies start crying http://www.soulprintsphotography.com/portl andchildphotographer/wp- content/uploads/2009/07/african-american- baby-photo.jpg

7. Source: Babies Crying Target: Cloud Cover Imagine you have a nursery full of sleeping babies. One baby starts crying because they are hungry. This wakes up the other babies and they start crying too. The nurse comes in and feeds the first baby. When that baby calms down, the others stop crying and go back to sleep. Babies CryingCloud Cover & Global Warming Baby is hungry and starts crying Other babies wake up and cry Nurse feeds first baby http://www.soulprintsphotography.com/portl andchildphotographer/wp- content/uploads/2009/07/african-american- baby-photo.jpg

8. Group work & Homework: Feedback Loops Part 2 : Group Work Work in your groups to complete the negative feedback loop and answer questions. Fill out the Group Worksheet to turn in at the end of class. Part 3: Homework If you complete your group work, you may start the homework. Please work on your own. This means your answers should be generally unique from other students. Turn in the homework using ANGEL.