City-Earth Spiral (IMAGE) Santa Fe Institute Caption In a new paper, Mingzhen Lu and Chris Kempes explore how three types of waste production — municipal solid waste, wastewater, and greenhouse gas emissions — scale with city size. (image: Elisa Heinrich Mora) Credit Elisa Heinrich Mora Usage Restrictions Artwork by Elisa Heinrich Mora License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.