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Understanding Climate Change
Gord MillerEnvironmental Commissioner of Ontario
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Climate Change is RealIt will Affect YOU!
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. . . And maybe your dog too.
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Absorbed Solar RadiationDetermines the Climate
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Did you spend last summer in the water?
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Or did you spend it bundled up?
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Most ‘earthlings’ spent it on the beachMost ‘earthlings’ spent it on the beach
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Temperature Anomalies Relative to 1952 – 1980 Average
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It was the second warmest ‘earth’ summer in 130 years
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Earth’s climate depends on the net amount of solar radiation that our planet absorbs
Climate change – fact or fiction?
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= How much we get – how much we loseEarth Net Absorbed Solar Radiation
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Why?Why?Climate has always changed on a long term cycle
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How much we get(Solar energy hitting earth)
depends on earth’s. . .
OrbitEccentricity
Axis Tilt Solar Cycle
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Eccentricity changes are on a 100,000 yr cycle
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get picture for tilt
Earth Axis Tilt Changes from 24 degrees to 22.5 degrees40,000 year cycle - agrees with glacial cycles
Glacial periods end whenthe earthreaches
a position ofmaximum
tilt
Earth axis tilt now
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From: James Hansen, Storms of My Grandchildren
Solar energy output is on an 11 year cycle
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How much we keep depends on . . .
Albedo(sunlight reflected
by our planet)
Greenhouse Gases(capture infra-red light
and re-radiate it)
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AlbedoOcean
Ice
Land
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Presently the Earth should be gradually sliding into a new ice age cycle but, due to human activities…
“ice ages will never occur again – unless humans go extinct”
James Hansen
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The whole process has changed …
Greenhouses gases are accumulating at a tremendous rate because of the activities of humans …
This increases ‘how much we keep’
But . . .
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Figure SPM.6. Projected surface temperature changes for the late 21st century (2090-2099). Temperatures are relative to the period 1980-1999.
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It’s your world . . .
Get involved !