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global warming.
overall rise in world's temperature caused by increase in concentration of greenhouse gases in atmosphere.
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greenhouse gases include:
water vapor, methane, carbon dioxide
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GH gases are
opaque to infra red radiation (heat) but transparent to other wave lengths of solar radiation.
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effect of rising of GH gases.
recession of glaciers around the world.
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threat of tipping point.
where negative feedback no longer can accomodate external forces and positive feedback kicks in.
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example of treats of tipping point.
- 1. ocean methane hydrate
- 2. ice, water vapor, and earth's albedo.
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ocean methane.
- methane more powerful than CO2 in re-radiating infra-red
- -stable in sediments,
- -cool geologic periods, methane held in; warm geologic periods, methane released.
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