Changes

MIT professor [[Richard Lindzen]] wrote:

MIT professor [[Richard Lindzen]] wrote:

:It is still of interest to ask what we would expect a doubling of carbon dioxide to do. A large number of calculations show that if this is all that happened, we might expect a warming of from .5 to 1.2 degrees centigrade. The general consensus is that such warming would present few, if any, problems. ... current models depend heavily on undemonstrated positive feedback factors to predict high levels of warming. [http://www.cato.org/pubs/regulation/regv15n2/reg15n2g.html]

:It is still of interest to ask what we would expect a doubling of carbon dioxide to do. A large number of calculations show that if this is all that happened, we might expect a warming of from .5 to 1.2 degrees centigrade. The general consensus is that such warming would present few, if any, problems. ... current models depend heavily on undemonstrated positive feedback factors to predict high levels of warming.<ref>http://www.cato.org/pubs/regulation/regv15n2/reg15n2g.html</ref>

Another professor wrote:

Another professor wrote:

:[[Computer model]]s suggest that a doubling of the concentration of the main greenhouse gas, carbon dioxide, may raise the [[average global temperature]] between 1 and 3° Celsius. However, the numeric equations of computer models do not accurately simulate the effects of a number of possible [[negative feedback]]s. For example, many of the models cannot properly simulate the negative effects that increased [[cloud cover]] would have on the [[radiation balance]] of a warmer Earth. Increasing the Earth's temperature would cause the [[ocean]]s to evaporate greater amounts of water, causing the atmosphere to become cloudier. These extra clouds would then reflect a greater proportion of the Sun's energy back to space reducing the amount of [[solar radiation]] absorbed by the atmosphere and the Earth's surface. With less solar energy being absorbed at the surface, the effects of an enhanced greenhouse effect may be counteracted. [http://www.physicalgeography.net/fundamentals/7h.html]

:[[Computer model]]s suggest that a doubling of the concentration of the main greenhouse gas, carbon dioxide, may raise the [[average global temperature]] between 1 and 3° Celsius. However, the numeric equations of computer models do not accurately simulate the effects of a number of possible [[negative feedback]]s. For example, many of the models cannot properly simulate the negative effects that increased [[cloud cover]] would have on the [[radiation balance]] of a warmer Earth. Increasing the Earth's temperature would cause the [[ocean]]s to evaporate greater amounts of water, causing the atmosphere to become cloudier. These extra clouds would then reflect a greater proportion of the Sun's energy back to space reducing the amount of [[solar radiation]] absorbed by the atmosphere and the Earth's surface. With less solar energy being absorbed at the surface, the effects of an enhanced greenhouse effect may be counteracted.<ref>http://www.physicalgeography.net/fundamentals/7h.html</ref>

 

[[Category:Ecology]]

[[Category:Ecology]]

[[Category:earth science]]

[[Category:earth science]]