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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: jlallen who wrote (449234)	1/21/2009 12:21:33 PM
From: combjelly	Read Replies (1) \| Respond to of 1576613

"but during 1940-1975 global temperatures actually declined while atmospheric carbon dioxide and carbon dioxide emission levels steadily increased." Sigh. Ok, let's put our thinking caps on. What significant events were going on in and around 1940? The result of both the proximate effect of the war and the resulting rise in industrial production meant a measurable increase in particulates in the atmosphere. Increased particulates means that less solar radiation makes it to the surface. And that results in heating of the upper atmosphere and cooling at the surface. Which is exactly what was measured. Now, what was occurring during the 1970s that might have resulted in reversing that trend? The air quality measures that were taken resulted in declining particulates in the atmosphere. Smog was also decreased considerably. I remember flying in the 1970s into Houston and the air turned noticeably browner as the plane descended. You don't see that any more.