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Copyright © United Nations Environment Programme, 2011

This publication may be reproduced in whole or in part and in any form for educational or non-profit purposes without special permission from the copyright holders, provided acknowledgement of the source is made. UNEP would appreciate receiving a copy of any publication that uses this publication as a source.

Disclaimer

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 its authorities, or concerning delimitation of its frontiers of boundaries. Moreover, the views expressed do not represent the decision or the standard policy of the United Nations Environment Programme, nor does citing of trade names or commercial processes constitute endorsement.

ISBN: 978-92-807-3107-1 Job Number: DTI/1309/PA

UNEP and GRID-Arendal promote environmentally sound

practices globally and in their own activities. This publication is printed on ecological paper.

Our distribution policies aim to reduce our carbon footprint.

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