Dear list-members,

As I m still working on air pollution I would like to get the most acual
values possible for d13C and concentration of atmospheric CO2 in
non-polluted areas (i.e. Greenland or the poles).
I think this should be around 330 ppm and an isotopic composition of about
-7,5%o.
Thank you very much.

David Widory
Laboratoire de Geochimie des Isotopes Stables-I.P.G.P.
Universite Paris 7-Denis Diderot
Tour 54-64 1er etage
4, place Jussieu
75252 Paris Cedex 05
Tel. 44 27 60 88
Fax. 44 27 28 30