*Editor’s note: In partnership with the City of Johannesburg we conducted a series of video interviews with mayors, leading sustainability officials and partner thought leaders during the C40 Mayors Summit in Johannesburg, South Africa on February 4-6, 2014. Take a look at our growing catalogue of video blogs to date…and stay tuned for more over the coming weeks.

At the C40 Mayors Summit in Johannesburg, we sat down with Adam Freed, Director, Global Securing Water Program at The Nature Conservancy, who discussed how increasing populations and climate change are putting major stress on the water resources of cities. The Nature Conservancy has projects in place to help relieve water stress particularly in Africa, and Freed detailed a project in the city of Nairobi, one of three African cities to join the C40 as its newest members during the Summit event.

“Water in cities is really critical, and cities are really at the heart of a global water crisis, which is a global issue, but very much based on local context. Only 15% of global water basins face water stress and scarcity, but 50% of cities over 100,000 people are located in those basins, so an enormous amount of pressure is being put on them…You’re challenged globally on how do you address these needs, how do you make more sustainable cities, how do you fuel economic growth with a finite resource that climate change is actually putting further strains and stresses on?”

Watch Adam Freed’s interview below.