<b>Case studies from cities on five continents demonstrate the advantages of thinking comparatively about urban environments.</b><p>The global discourse around urban ecology tends to homogenize and universalize, relying on such terms as “smart cities,” “eco-cities,” and “resilience,” and proposing a “science of cities” based largely on information from the Global North. <i>Grounding Urban Natures</i> makes the case for the importance of place and time in understanding urban environments. Rather than imposing a unified framework on the ecology of cities, the contributors use a variety of approaches across a range of of locales and timespans to examine how urban natures are part of—and are shaped by—cities and urbanization. <i>Grounding Urban Natures</i> offers case studies from cities on five continents that demonstrate the advantages of thinking comparatively about urban environments.</p><p>The contributors consider the divers