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Do Now:

Do Now:. At night the moon is -387  F, and during the day it is 253  F. Why do you think it is so much colder and hotter on the moon than on earth? Three factors keep earth from being frozen and cold: the sun, the atmosphere, and the oceans. . Volcanoes and the Greenhouse Effect.

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Do Now:

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  1. Do Now: • At night the moon is -387 F, and during the day it is 253 F. Why do you think it is so much colder and hotter on the moon than on earth? • Three factors keep earth from being frozen and cold: the sun, the atmosphere, and the oceans.

  2. Volcanoes and the Greenhouse Effect

  3. Hypothesis • Take a moment to write down some hypothesis for what will happen to: 1) The 2 beakers simulating greenhouse effect 2) The glass with ice simulating icebergs and sea ice 3) The glass with ice simulating glaciers and land ice

  4. When the Earth was young there was no atmosphere and no oceans. • Like the moon, it was very hot during the day and very cold at night • All of the water and gasses that now make up the atmosphere and the oceans were mixed up with the magma and lava that made up the early earth

  5. As volcanoes erupted, they released gasses and steam into the atmosphere http://www.youtube.com/watch?v=5huGCDBJc7s&feature=related

  6. As more gases were released, the earth took on an atmosphere • By trapping heat, the atmosphere is what keeps the Earth from freezing at night. • The atmosphere also reflects some of the Sun’s heat, keeping the Earth from frying during the day. • The oceans also absorb the Sun’s heat and act like a blanket for the Earth.

  7. Pair and Share…Stop and Jot • Talk to the person sitting next to you about how volcanoes were important part of creating the Earth’s oceans and the atmosphere. Why do the oceans and the atmosphere help keep the Earth’s temperature stable? • Then, summarize what you learned on your activity sheet.

  8. Volcanic Ash and the Atmosphere • In the Early history of the Earth, volcanoes created the atmosphere—which helped to WARM the Earth. • However, when volcanoes erupt nowadays, the Earth cools instead. Why? • Because volcanoes shoot up ash into the atmosphere (they also emit greenhouse gases, but now we already have an atmosphere so they don’t make much of a difference). • The ash in the atmosphere reflects sunlight and cools the Earth temporarily.

  9. Stop and Jot • Why did volcanoes in the early Earth help WARM the Earth but volcanoes in modern times COOL it? • OK, back to the atmosphere!

  10. How exactly does the atmosphere keep the Earth warm? The Greenhouse Effect

  11. The Greenhouse Effect has kept the Earth warm for billions of years. The problem is, now it’s making the Earth too HOT!

  12. GLOBAL WARMING Recently, too manycarbon emissions (putting CO2 into the air) have put more greenhouse gases into the atmosphere.

  13. Examples of carbon emissions: • Burning gas in cars • Burning coal/oil in factories c) Using a lot of electricity

  14. Example: CO2 Methane (CH4) Burning fossil fuels Deforestation

  15. THICKER greenhouse gases have trapped more heat. This has caused the Earth’s temperature to increase!

  16. GLOBAL WARMING is the increase of the Earth’s average surface temperature due to a build-up of greenhouse gases in the atmosphere. CLIMATE CHANGE is a broader term that refers to long-term changes in climate, including average temperature and precipitation. Difference

  17. Even worse, global warming starts new processes in motion that SPEED UP warming

  18. Need more evidence? • 11 out of the last 13 years have been the hottest on record. • Ice caps are shrinking: • All scientists agree that climate change is real and we must do something about it

  19. 2004 1914 Glaciers Shrinking • Alaska Photos: NOAA Photo Collection and Gary Braasch – WorldViewOfGlobalWarming.org

  20. Colorado River • Arizona June 2002 Dec 2003

  21. Pair and Share…Stop and Jot • Take a few minutes to summarize why global warming is happening, and what is the evidence

  22. Why should we care Rising Sea Level Increased Temperature Habitat Damage and Species Affected Changes in Water Supply

  23. Habitat Destruction and Species Affected

  24. Sea Level Rise

  25. Even if all this doesn’t convince you, we should still do something. Let me show you why…

  26. Ok, what can we do!? • There is no one solution to global warming. In fact, global warming will take a long time to turn around and some effects are inevitable. • We need to make substantial changes to the way we use energy, how our electricity is produced, and how the products we buy are made. • We may even need to find ways of taking CO2 out of the atmosphere! • To see some small ways you can make a difference, we are going to do a GALLERY WAlK!

  27. Exit Slip • 1) Explain why volcanoes in the early Earth helped to warm the Earth but volcanoes in modern times cool it temporarily? • 2) What are two pieces of evidence for global warming? And, why should we care?

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