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First published by the United Nations Environment Programme in 2012 Copyright © 2012, United Nations Environment Programme


This publication may be reproduced in whole or in part and in any form for educational or non-profit services without special permission from the copyright holder, provided acknowledgement of the source is made.


UNEP would appreciate receiving a copy of any publication that uses this publication as a source.


No use of this publication may be made for resale or any other commercial purpose whatsoever without prior permission in writing from the United Nations Environment Programme.


Applications for such permission, with a statement of the purpose and extent of the reproduction, should be addressed to the Director, DCPI, UNEP, P.O. Box 30552, Nairobi, 00100, Kenya.


The designations employed and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of UNEP concerning the legal status of any country, territory or city or its authorities, or concerning the delimitation of its frontiers or boundaries.


Mention of a commercial company or product in this publication does not imply endorsement by the United Nations Environment Programme. The use of information from this publication concerning proprietary products for publicity or advertising is not permitted.


UNEP promotes environmentally sound practices globally and in its own activities. This report has been made available electronically to reduce the amount of printed reports.

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