"In Portland, Oregon, rows of sedge plantings and aspen trees sit on what used to be an asphalt parking lot. In Las Vegas, homeowners trade their lawns for vast wads of cash. Birds flying over Chicago see fields of sedum on rooftops, and wastewater in Orange County is transformed into water that's as clean as what comes out of the tap. The common thread to all of these examples? A desire to better manage water," writes Amara Holstein.