Sunday, June 26, 2005

The Wall Street Wingnuts

More naysayer nonsense from WSJ on global warming torn to bits by real scientists here at realclimate.org. Take a look. This a key passage for me.
The natural causes of past climate variations are increasingly well-understood, and they cannot explain the recent global warming. As discussed elsewhere on this site, modeling studies indicate that the modest cooling of hemispheric or global mean temperatures during the 15th-19th centuries (relative to the warmer temperatures of the 11th-14th centuries) appears to have been associated with a combination of lowered solar irradiance and a particularly intense period of explosive volcanic activity. When these same models are forced with only natural radiative forcing during the 20th century [see e.g. Crowley (2000)] they actually exhibit a modest cooling trend. In other words, the same natural forcings that appear responsible for the modest large-scale cooling of the "Little Ice Age" should have lead to a cooling trend during the 20th century (some warming during the early 20th century arises from a modest apparent increase in solar irradiance at that time, but the increase in volcanism during the late 20th century leads to a net negative 20th century trend in natural radiative forcing). In short, given natural forcing factors alone, we should have basically remained in the "Little Ice Age". The only way to explain the upturn in temperatures during the 20th century, as shown by Crowley (2000) and many others, is indeed through the additional impact of anthropogenic (i.e., human) factors, on top of the natural factors.

3 Comments:

Blogger Mark said...

I suppose a small mind would. Since I'm half French I don't find that amusing or intelligent. Good day.

4:54 PM  
Anonymous Anonymous said...

Hey guy
That msn pop-up is annoying as hell. Once, alright, but five or six times!!!!

9:11 AM  
Blogger Mark said...

What the hell are you talking about? I have a pop-up blocker on my MSN browser.

10:54 AM  

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