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15 Cards in this Set
- Front
- Back
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big bang
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expanding universe began to cool down, galaxies form
10-20 bya |
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volcanic eruptions
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move material from earths crust to atmosphere
asteroids colliding= water |
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how do we know all this stuff that happened hella long ago?
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analysis of crystals in rocks in Australia
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heterotrophic
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use organic molecules, break down to harvest energy
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autotrophy
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solved organic carbon scarcity problem
*harvest energy from environment |
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photosynthesis
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harvest most abundant energy source- sun
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why is evolution of oxygenic photosynthesis so important?
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change oxidative balance on earth
ozone layer forms --> protects from UV --> life on land -CO2 decreases, cools temp -O2 builds up in ocean, atmos |
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when did humans appear?
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1 million yrs ago
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early human impact
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agriculture
heating manufacturing deforestation very small scale- limited energy use, small pop |
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industrialization
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18th century
energy source switches from mostly renewable to fossil-fuel based EXPLOSION OF ENERGY CONSUMPTION |
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extent of air pollution from industrialization
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global scale, exponential increase
very fast (200 yrs) |
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what controls global air pollution?
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1. pop size
2. per capita resource consumption 3. efficiency of energy consumption (only thing changing) |
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graphs of global pop vs. global CO2
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very similar increase, steep
b/c of fossil fuels |
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how can we control pollution?
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1. reduce pop
-move away (regionally) 2. reduce consumption -drive less, turn off lights 3. increase efficiency -technology **POLITICAL, SOCIAL DECISIONS |
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evolution of atmosphere
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1. first atmos forms
2. secondary atmos forms 3. water condenses, forms oceans, CO2 dissolves 4. anaerobic bacteria evolve 5. O2 forms 6. aerobic bacteria evolve 7. ozone layer forms 8. life moves from water to land |
