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From: Dave Baum - Drew University Physics Dept. <DBAUM@drew.edu>you
P.S. interesting that the CO2 concentration shown in the http site
mention shows an annual cycle. Does anyone know why this is?Possibly
aphelion and perihelion?produced/absorbed by vegetation from winter to summer. Remember that
I THINK that the annual cycle is just the variation in the CO2
and therefore vegetation is in the northern hemmisphere.