From: "Dave Baum - Drew University Physics Dept." <DBAUM@drew.edu>
Date: Tue, 16 Jul 1996 18:54:16 -0400 (EDT)
P.S. interesting that the CO2 concentration shown in the http site you
mention shows an annual cycle. Does anyone know why this is? Possibly
aphelion and perihelion?
I THINK that the annual cycle is just the variation in the CO2 produced/absorbed by vegetation from winter to summer. Remember that most of the land surface
and therefore vegetation is in the northern hemmisphere.