<p>Section 1: Introduction to nature-based solutions and water security<br>1. Setting the scene: Nature-based solutions and water security<br>Jan Cassin and John H. Matthews<br>2. History and development of nature-based solutions: Concepts and practice<br>Jan Cassin</p> <p>Section 2: State of science and knowledge<br>3. Addressing water security through nature-based solutions<br>Kari Vigerstol, Robin Abell, Kate Brauman, Wouter Buytaert, and Adrian Vogl<br>4. Nature-based solutions, water security and climate change: Issues and opportunities<br>Jan Cassin and John H. Matthews<br>5. Nature-based solutions, sustainable development, and equity<br>Leah L. Bremer, Bonnie Keeler, Puaʻala Pascua, Rebecca Walker, and Eleanor Sterling</p> <p>Section 3: State of policy and governance<br>6. Why governments embrace nature-based solutions: The policy rationale<br>Kathleen Dominique, Nathanial Matthews, Lisa Danielson, and John H. Matthews<br>7. Nature-based solutions in international policy instruments<br>Ingrid Timboe and Kathryn Pharr<br>8. Legible rivers, resilient rivers: Lessons for climate adaptation policy from the Wild and Scenic Rivers Act<br>Denielle M. Perry</p> <p>Section 4: Nature-based solutions in action<br>9. Nature-based solutions for source water protection in North America<br>Jan Cassin<br>10. Protecting source waters in Latin America<br>Marta Echavarria, Jan Cassin, and Jose Bento da Rocha<br>11. Mobilizing funding for nature-based solutions: Peru’s drinking water tariff<br>Cheyenne Coxon, Gena Gammie, and Jan Cassin<br>12. Urban blue spaces, health, and well-being<br>Paula Vandergert, Pauline Georgiou, Lisa Peachey, and Sam Jelliman<br>13. Learning from indigenous and local knowledge: The deep history of nature-based solutions<br>Jan Cassin and Boris F. Ochoa-Tocachi<br>14. Nature-based solutions and corporate water stewardship<br>Naabia Ofosu-Amaah, Robin Abell, Jehanne Fabre, Paul Fleming, Michael Matosich, Jason Morrison, and Tara Varghese<br>15. Funding and financing to scale nature-based solutions for water security<br>Sophie Trémolet, Brooke Atwell, Kathleen Dominique, Nathanial Matthews, Michael Becker, and Raul Muñoz</p> <p>Section 5: Moving to scale: What is needed<br>16. Mainstreaming nature-based solutions through insurance: The five “hats of the insurance sector<br>Elena Lopez-Gunn, Monica A. Altamirano, Mia Ebeltoft, Nina Graveline, Roxane Marchal, David Moncoulon, Beatriz Mayor, Florentina Nanu, Nora Van Cauwenbergh, Peter van der Keur, Josh Weinberg, Pedro Zorrilla Miras, and Jan Cassin<br>17. Operationalizing NBS in low- and middle-income countries: Redefining and “greening project development<br>Alex Mauroner, Nureen F. Anisha, Ernesto Dela Cruz, Eugenio Barrios, and Sujith Sourab Guntoju<br>18. Nature-based solutions: Action for the 21st century<br>Jan Cassin, John H. Matthews, Elena Lopez-Gunn, Leah L. Bremer, Cheyenne Coxon, Kathleen Dominique, Marta Echavarria, Gena Gammie, Roxane Marchal, Alex Mauroner, Naabia Ofosu-Amaah, Denielle M. Perry, Eleanor Sterling, Ingrid Timboe, Paula Vandergert, Kari Vigerstol, and Sophie Trémolet</p>