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NATURE-BASED SOLUTIONS FOR WATER The United Nations World Water Development Report 2018 Published in 2018 by the United Nations Educational, Scientific and Cultural Organization, 7, Place de Fontenoy, 75352 Paris 07 SP, FranceUNESCO 2018 This report is published by UNESCO on behalf of UN-Water. The list of UN-Water Members and Partners can befound on the following website unwater. ISBN 978-92-3-100264-9 Suggested citation:WWAP (United Nations World Water Assessment Programme)/UN-Water. 2018.The United Nations World WaterDevelopment Report 2018: Nature-Based Solutions for Water . Paris, UNESCO. This publication is available in Open Access under the Attribution-ShareAlike 3.0 IGO (CC-BY-SA 3.0 IGO) license(creativecommons/licenses/by-sa/3.0/igo/). By using the content of this publication, the usersaccept to be bound by the terms of use of the UNESCO Open Access Repository (unesco/open-access/ termsuse-ccbysa-en). The present license applies exclusively to the text content of the publication. For the use of any material notclearly identified as belonging to UNESCO, prior permission shall be requested from: publication.copyright@ unesco or UNESCO Publishing, 7, Place de Fontenoy, 75352 Paris 07 SP, France. The designations employed and the presentation of material throughout this publication do not imply theexpression of any opinion whatsoever on the part of UNESCO concerning the legal status of any country,territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. The ideas and opinions expressed in this publication are those of the authors; they are not necessarily thoseof UNESCO and do not commit the Organization. The contents were contributed by the UN-Water Membersand Partners listed on the title pages of the chapters therein. UNESCO and the United Nations World WaterAssessment Programme (WWAP) are not responsible for errors in the content provided or for discrepanciesin data and content between contributed chapters. WWAP provided the opportunity for individuals to belisted as authors and contributors or to be acknowledged in this publication. WWAP is not responsible for anyomissions in this regard. Original cover design by Phoenix Design Aid Printed by UNESCO, Paris This publication is printed in vegetable inks on FSC Mixed Sources paper, supporting responsible use of forestreserves, 100% recycled, acid-free and chlorine-free. Printed in France Foreword iv by Audrey AzoulayDirector-General of UNESCOForeword v by Gilbert F. HoungboChair of UN-Water and President of the International Fund forAgricultural DevelopmentPreface vi by Stefan Uhlenbrook, WWAP Coordinatorand Richard Connor, Editor-in-ChiefAcknowledgements viii Executive Summary 1 Prologue: The state of water resources in the context of nature-based solutions 9 TABLE OF CONTENTS 。。。。。。