Dear participants,

As it always happens, it is time to close our official discussion. I would
like to thank the authors for an excellent paper on a subject of
great importance for Mexico City. Having visited Mexico on various occasions
myself and having even taught in Mexico on environmental issues,  I have seen
the huge markets and the leftovers after the markets. I found the paper very
fascinating and encouraging to see the enthusiasm and the will to help
solving an almost insurmantable task.

As I said in my discussion contribution I would like to see eventually  a
link being made with anaerobic digestoin and methane production, despite the
fact that Mexico has a fair amount of oil. However, there are many areas in
Mexico, where we have significant poor populations, who would love to have
electricity or cooking facilities with biogas. Even in Mexico City it could
be used for feeding into the grid.

On the other hand I have also been able to see areas close to Mexico City,
where compost and manure helped converting non-arable soil into beautiful
arable soil with citrus trees and many other crops. I have always been
impressed with self-initiatives, which are not rare in this beautiful country.

I sincerely hope that Prof.Losada and his group will be able to expand their
work in future. Please accept my wholehearted congratulations. I also like to
thank all participants for their individual contributions and hope that they
learned from this presentatoin as much as I did. There are not many cities
with a population of 22 million + and with markets like  the one described in
this paper and the pollution problems.

I wish the authors all the best for their huge program and thank them most
sincerely for letting us have a little taste of the huge problem.

Horst Doelle
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Horst W.Doelle, D.Sc., D.Sc. [h.c.]
Chairman, IOBB
Director, MIRCEN-Biotechnology
FAX: +617-38783230
Email: doelle@ozemail.com.au