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Politics : The Environmentalist Thread

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To: neolib who wrote (19359)	1/3/2008 1:37:01 PM
From: Thomas A Watson	Read Replies (2) of 36921

dear neolib AKA ear2earfeces, " claiming something on the order of 1% or so of the incoming heat energy ends up in the greenhouse air." is simply another declaration of the depth and breath of your ignorance of the basic mechanisms of physics. More that half the energy entering a green house by it's convection blocking glass is light in the visible spectrum. When visible light strikes a surface all energy not reflected is absorbed and is conserved by heating the surface that absorbed it. Now in that much of many plants is green, clearly they are reflecting green wavelengths. And by the way, if you were above the green house and looked you could see all within, that means all that reflected light or energy ends up in the greenhouse air and passing through. In addition all sunlight entering the greenhouse is passing through the air. It seems the wiki explanation of Greenhouse_effect also declare neolib AKA ear2earfeces, aaatt. en.wikipedia.org Real greenhouses A greenhouse is built of glass; it heats up primarily because the Sun warms the ground inside it, which warms the air near the ground, and this air is prevented from rising and flowing away. The warming inside a greenhouse thus occurs by suppressing convection and turbulent mixing. The warming inside a greenhouse thus occurs by suppressing convection and turbulent mixing. This can be demonstrated by opening a small window near the roof of a greenhouse: the temperature will drop considerably. It has also been demonstrated experimentally (Wood, 1909): a "greenhouse" built of rock salt (which is transparent to IR) heats up just as one built of glass does. Greenhouses thus work primarily by preventing convection; the atmospheric greenhouse effect however reduces radiation loss, not convection. It is quite common, however, to find sources (e.g., [3] [4]) that make the "greenhouse" analogy. [4]http://www.epa.gov/globalwarming/kids/greenhouse.html ngdc.noaa.gov

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