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Are you ready for the quiz?
Review yesterday’s notes in interactive notebook.
Practice with objectives #1-4.
Climate – on a geologic scale – WAAAAY back in the day!
First, try this:
Take the average of the following numbers: 100, 0
Take the average of 100,100,100,100,100,100,100,100,100,& 0
(that’s 9 sets of 100)
How does having more data affect an average?Your GPA is a lot harder to change than a progress report grade.
Use your graph-reading skills to complete the worksheet
Interactive notebook: New page
Title: Historical Climate Date: April 14
Cut out Graph A and glue it onto the right side. Leave space below for notes
Title the graph Historical Climate Change
*Graph: Three important inferences
Climate change is natural on Earth 100,000 year cycles between glacial
maximum (ice age) and interglacial periods (maximum warmth)
A change in -3oC can create an ice age
A change of 1o is significant
Global average temperature = 59oF Current CO2 concentration = 398ppm (changing your GPA is much harder than
changing a progress report average in one class)
Observations?
*Milankovitch cycles
Combination of these effects creates 100,000 year cycle of warming and cooling
Earth’s orbitaround the sun
Ice core sampling
We are changing the carbon cycle – burning ancient carbon (fossil fuels) moves C into the air.
*Climate and civilization
Human civilizations change when climate changes
Farming relies on predictable weather
Mayan civilization – collapses suddenly 950 CE (common era – used to be called AD)
Leif Erikson – 950 CE sails to Greenland
Black Death in Europe – famine 1315-1317 – needed to import grain from China
Little Ice age – 1550-1850Irish Potato Famine
Dust Bowl – 1930’s
drought+ poor farming practices
Wrap it up!
Which is surprising to climatologists – that the climate changes or the current rate of change?
Has climate always been the same on Earth?
What are Milankovitch cycles?
How do we depend on predictable climate?