- U-Th Series Nuclides in Aquatic Systems
- Umweltgeschichte
- Umweltgeschichte im Überblick
- Umweltgeschichte in Beispielen
- Umweltgeschichte und Kausalität
- Un planeta sobrepoblado y platos vacíos
- Un'altra fine del mondo è possibile
- Una visita a Damanhur - italiano
- Under the Maples - The Last Portrait of John Burroughs
- Understanding the Global Warming Hoax
- Understanding the Long-Term Evolution of the Coupled Natural-Human Coastal System
- Understanding Urban Ecology
- Une écologie post-virus
- UNESCO Global Geoparks
- Unnatural Selection
- Unsolved Problems in Ecology
- Uplands and Birds
- Uranium in Plants and the Environment
- Urban Biodiversity and Ecological Design for Sustainable Cities
- Urban Climate Resilience in Southeast Asia
- Urban Ecology (Enhanced Edition)
- Urban Ecosystems
- Urban Ecology (Enhanced Edition)
- Urban Ecosystems
- Urban Horticulture
- Urban Mining and Sustainable Waste Management
- Urban Services to Ecosystems
- Urban Transformations
- Urban Vulnerability and Climate Change in Africa
- Urban Wastelands
- Urban Water Management for Future Cities
- Urban Wildlife Conservation