Global sea level was much lower during past ice ages

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Global sea level was much lower during past ice ages. This map shows the coastline of eastern North America during the most recent ice age.
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Climate Present and Future • The Greenhouse Effect involves sun light (energy) entering the atmosphere and a component of the atmosphere (H 2 O, CO 2 ) trapping radiant heat (infrared energy) The result is warming of the atmosphere Increases, or decreases, in the concentration of CO 2 in the atmosphere will show a respective increase, or decrease, in global warming
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Composition of the Atmosphere Nitrogen 78% Oxygen 21% Trace gases 1% – Argon Water vapor Carbon dioxide – Ozone – Methane Oxides of nitrogen – Neon – Helium – Radon
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Effective Temperature of Sun = 5500 C Temperature of Earth = 15C or -17C without greenhouse effect
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Greenhouse gases act like glass in a gardener’s greenhouse. Light enters the greenhouse, changes to heat, and is trapped inside by the glass. Likewise, sunlight enters the atmosphere, is changed to heat, and is trapped by greenhouse gases, most notably water vapor and carbon dioxide.
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The Greenhouse Effect Without water greenhouse gases temperature on Earth would have been -17 ° C. Most abundant greenhouse gas in water vapor (CO 2 next).
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