Environmental History What causes “natural” environmental change?

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Presentation transcript:

Environmental History What causes “natural” environmental change?

External Changes 1.Solar luminosity 2.“Slowing” of Earth’s rotation 3.Earth’s orbit 4.Magnetic field 5.Meteorite/comet impacts

Solar Luminosity

Earth’s Rotation & the Moon

Orbital Changes

Magnetic Field

Meteorite/Comet Impacts

Environmental History What causes “natural” environmental change? Internal Changes 1.Plate tectonics 2.“Natural disasters” 3.Atmospheric changes 4.Climate change 5.Rising & falling sea level

Plate Tectonics

 Earth’s “surface” is broken into plates  Plates move  “Geology happens” where the plates interact with one another

Growth of Continents

“Natural Disasters”

Atmospheric Changes

Climate Change

Sea Level Changes

So why are we concerned about “human” changes?

ImPaCT ( Ehrlich & Holdren) Human Impact (Im) = Population (P) x Consumption (C) x Technology (T)