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GLOBAL WARMING
IN GROUPS:
• EXAMINE EVIDENCE
• DECIDE ON RELEVANCE
• PREPARE EXPLANATION
• NOMINATE SPOKESPERSON
MODEL PROJECTIONS OF TEMPERATURE IN THE FUTUREA
CARBON DIOXIDE RISING BUT NOT TEMPERATUREB
RISING SEA LEVELSC
CHANGES IN TEMPERATURED
GLOBAL POPULATIONE
CHANGES IN THE SUN AND THEIR EFFECTSF
The sun is a constantly changing series of explosions!
The sun on 24/6/09 from the SOHO spacecraft
SOLAR CONTROL OF CLIMATE?
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.
Further, the tilt of the earth’s axis changes slightly over a 40,000 year cycle
The tilt angle of the Earth also show precession
WE ARE HERE