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CO2 concentrations in air (OT?)

To: <Aquatic-Plants at actwin_com>
Subject: CO2 concentrations in air (OT?)
From: "Doug Karpa-Wilson" <dkarpawi at indiana_edu>
Date: Thu, 20 Dec 2001 09:51:37 -0500
References: <200112200848.fBK8m3225756 at actwin_com>


> I thought, and the recent APD discussion appears to
> > confirm, that the concentration of CO2 in air was about 350 ppm


Hey, as long as I'm wearing my biogeochemist hat, I thought I'd chip in and
point out that 350's about 20 years out of date.  The atmospheric
concentration is up around 370ppm now and climbing by around 1.5 ppm each
year.  I measure photosynthesis a lot in my job, so I've been able to watch
it climb pretty steadily.  350 is a number that reminds me of the Cold War,
Ronald Reagan, and Culture Club.

Doug

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