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Prof. Arysio Nunes dos Santos Research

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Datarius
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« Reply #15 on: December 06, 2009, 10:45:24 pm »

Wherever Life exists, as on Earth, increased CO2 contents of the atmosphere also results in increased photosynthesis. Plants grow more luxuriously, fixing the excess carbon dioxide in themselves, and alleviating the situation. The opposite process happens if the CO2 content of the atmosphere is reduced for some reason. Photosynthesis is consequently reduced and plant matter - mainly the plankton in the seas, rather than the tropical forests — decreases, liberating CO2. This increases the atmospheric content, tending to increase earth's temperature back to its normal value.

However, this compensation only works within rigid limits, and any excessive perturbation can trigger an Ice Age or a Hot Age. Like with flip-flops and balances, the transition is enhanced by positive feedback, and quickly leads to the extreme situations that are, again, stable and permanent until triggered back on again. For instance if the seas warm up, the solubility of CO2 is decreased, and its atmospheric content increases, tending to further increase earth's temperature, and vice-versa.

Moreover, an ice cover effectively reflects sunlight back towards outer space, reducing the amount of solar heat absorbed by the earth. Its temperature consequently drops, and the glaciers further increase, until they cover all the temperate regions of earth. In the absence of Life, we have the two extremes instanced by our two neighboring planets, Venus and Mars. As we said above, Venus is as hot as hell, whereas Mars is completely frozen up, as if to vividly exemplify to us all the two extremes of lifeless conditions.
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