Environmental History What causes “natural” environmental change?
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Transcript of Environmental History What causes “natural” environmental change?
Environmental HistoryWhat causes “natural” environmental
change?
Environmental HistoryWhat causes “natural” environmental
change?
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Environmental HistoryWhat causes “natural” environmental
change?
Environmental HistoryWhat causes “natural” environmental
change?
External Changes1. Solar luminosity2. “Slowing” of Earth’s rotation3. Earth’s orbit4. Magnetic field 5. Meteorite/comet impacts
Solar LuminositySolar Luminosity
Earth’s Rotation & the Moon
Earth’s Rotation & the Moon
OrbitalChangesOrbitalChanges
Magnetic FieldMagnetic Field
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Meteorite/Comet Impacts
Meteorite/Comet Impacts
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Environmental HistoryWhat causes “natural” environmental
change?
Environmental HistoryWhat causes “natural” environmental
change?
Internal Changes1. Plate tectonics2. “Natural disasters”3. Atmospheric changes4. Climate change5. Rising & falling sea level
Plate TectonicsPlate Tectonics
Plate TectonicsPlate Tectonics
Earth’s “surface” is broken into plates
Plates move“Geology happens” where the plates interact with one another
Growth of ContinentsGrowth of Continents
“Natural Disasters”“Natural Disasters”
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Atmospheric ChangesAtmospheric Changes
ClimateChange
ClimateChange
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Sea LevelChanges
Sea LevelChanges
So why are we concernedabout “human” changes?So why are we concernedabout “human” changes?
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ImPaCT(Ehrlich & Holdren)
ImPaCT(Ehrlich & Holdren)
Human Impact (Im) =
Population (P) x Consumption (C) x Technology (T)