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14 cards from this deck
About 150 years
Orbital changes, volcanic activity, solar output
Solar radiation received & glacial periods
Warmer climate
Large quantities of ash into atmosphere
Reflects & blocks sun's rays, cooling earth
Every 11 years
More sun energy, warmer climate
Burning fossil fuels, farming, deforestation
CO2 into the atmosphere
Methane
Flooded fields emit methane
Remove CO2 from atmosphere
Greenhouse gases absorb & reflect heat back to earth
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