This is a United Nations Environment Programme publication, written and produced by GRID-Arendal at the request of the Environment Management Group.
Copyright©2008 UNEMG, UNEP/GRID-Arendal
Printed with plant-based ink on 100% recycled paper at PROGRESS PRESS LTD – MALTA
This publication may be reproduced in whole or in part in any form for educational or non-profit purposes without special permission from the copyright holders, provided acknowledgement of the source is made. UNEP and EMG would appreciate receiving a copy of any material that uses this publication as a source.
No use of this publication may be made for resale or for any commercial purpose whatsoever without prior permission in written form from the copyright holders. The use of information from this publication concerning proprietary products for advertising is not permitted.
The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the United Nations Environment Programme concerning the legal status of any country, territory, city or area or of its authorities, or concerning delimitation of its frontiers or boundaries Mention of a commercial company or product does not imply endorsement by the cooperating partners. We regret any errors or omissions that may unwittingly have been made. Moreover, the views expressed do not necessarily represent the decision or the stated policy of the United Nations Environment Programme, nor does citing of trade names or commercial processes constitute endorsement.