kitstolz wrote:
> As you may seen in this People interview 
> (http://people.aol.com/people/article/0,26334,1210402,00.html)
> 
> George Bush is claiming that "there is a debate whether [global 
> warming] is caused by mankind or whether its caused naturally." He's 
> been saying this for some months now.
> 
> But, really, who in science is claiming that the warming observed in 
> the last twenty-five years is caused naturally? Even the contrarians 
> that come to mind--Lomborg and Lindzen--may argue that global warming
>  is not an issue that requires us to act, but I don't believe they're
>  doubting that it's caused by greenhouse gases.

Lindzen's views seem to have departed further and further from the
mainstream over the years, to the point where he's now sometimes saying
things that are flat-out wrong.  Here's one of his recent essays:

http://www.cato.org/pubs/regulation/reg15n2g.html

in which one will find:

> The main absorbers of infrared in the atmosphere are water vapor and
> clouds. Even if all other greenhouse gases (such as carbon dioxide
> and methane) were to disappear, we would still be left with over 98
> percent of the current greenhouse effect.

This is a common talking point amongst the professional naysayers but
Linzen should know better.  See Coby Beck's brief discussion at:

http://illconsidered.blogspot.com/2006/02/climate-scientists-hide-water-vapor.html

or the longer (excellent) presentation on RealClimate at:

http://www.realclimate.org/index.php?p=142

- Ray

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