GLOBAL WARMING. IN GROUPS: EXAMINE EVIDENCE DECIDE ON RELEVANCE PREPARE EXPLANATION NOMINATE...

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