Dear all,
some years ago I  saw a paper describing carbonate precipitates 
(speleothems) from a highway underpass with very low delta 13-C values, 
attributed to the CO2 exhausts from traffic. Now I can't find it any 
more. Can you help me - does anybody have this paper or similar results 
of his/her own?
Many thanks for your help,
kind regards
Sonja Lojen

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Dr. Sonja Lojen
Odsek za znanosti o okolju - Department of Environmental Sciences
Institut J. Stefan - J. Stefan Institute
Jamova 39
1000 Ljubjlana
Slovenia

Tel.: (+386 1) 5885 393
Fax: (+386 1) 5885 346