Climate Change What is climate?



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Climate Change


Climate Change
What is climate?
Climate is an average of weather (Temperature, Rainfall...) over a “long” time (more than 2-3 weeks).
weather
climate (average min/max)
Weather and Climate in Seattle:
What makes climate change?
  • Changes in the sun
  • Changes in the earth's orbit
  • Changes in the clouds
  • Changes in ice sheets
    • Volcanic eruptions
  • Changes in the gases in the atmosphere (Greenhouse effect)
  • Internal Wiggles (for example El Nino)

Some cause bigger changes, some cause small changes
Some cause slower changes, some cause fast changes
Some cause changes that last, some cause changes that go away fast
How has climate changed in the past?
  • Ice Ages

Now
21 thousand years ago
  • Eocene Warm Period

How has climate changed in the past?
Human-Forced Climate Change
  • Climate changes can be natural or human caused.
  • Humans can affect

  • the climate by
    changing the gases
    in the atmosphere.
    (greenhouse
    effect).

The Greenhouse Effect

Human influence on climate: the greenhouse effect
Have we changed the climate?
Changes in global temperature over the last 125 years
Have we changed the climate?
Changes in global temperature over the last 1,000 years

Thank you for attention!


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