global warming. in groups: examine evidence decide on relevance prepare explanation nominate...
TRANSCRIPT
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GLOBAL WARMING
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IN GROUPS:
• EXAMINE EVIDENCE
• DECIDE ON RELEVANCE
• PREPARE EXPLANATION
• NOMINATE SPOKESPERSON
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MODEL PROJECTIONS OF TEMPERATURE IN THE FUTUREA
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CARBON DIOXIDE RISING BUT NOT TEMPERATUREB
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RISING SEA LEVELSC
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CHANGES IN TEMPERATURED
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GLOBAL POPULATIONE
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CHANGES IN THE SUN AND THEIR EFFECTSF
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The sun is a constantly changing series of explosions!
The sun on 24/6/09 from the SOHO spacecraft
SOLAR CONTROL OF CLIMATE?
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The ellipticity of the earth’s orbit varies over a 100,000 year cycle. This changes the solar flux received at the earth by as much as 30%.
Milankovitch cycles Named after the man who proposed them as the explanation of the ice ages in the Pleistocene. These are variations in the Earth’s orbit and inclination.
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Further, the tilt of the earth’s axis changes slightly over a 40,000 year cycle
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The tilt angle of the Earth also show precession
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WE ARE HERE
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