Water

How We Can All Make Waves: Earth Day Reflections from Columbia Water Center

http://blogs.ei.columbia.edu/2018/04/20/earth-day-columbia-water-center/

Quote in Mike Hower's 'Sustainable Cities Summit tackles the challenges of urban sustainability'

https://www.planetforward.org/2016/04/28/sustainable-cities-summit-tackles-the-challenges-of-urban-sustainability

Quote in Mike Hower's 'The 5 toughest challenges tomorrow’s cities face'

https://www.greenbiz.com/article/5-toughest-challenges-tomorrows-cities-face