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Annual CO2 cycle



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?

It's the Earth "breathing". Photosynthesis causes the CO2 concentration
to decline during the Northern hemisphere's growing season. (The
Northern hemisphere having most of the Earth's land mass.)

Eric Anderson
Avila College
11901 Wornall Rd.
Kansas City, MO 64145
(816)942-8400 x2222
andersonec@mail.avila.edu