Welcome! I'm a philosophy professor at Colorado State University living in Fort Collins, Colorado with my wife Kris and sons Henry and Tom. My scholarly work centers on environmental ethics, population and consumption issues, and the preservation of wild nature. I'm the author of Thoreau's Living Ethics: Walden and the Pursuit of Virtue and How Many Is Too Many? The Progressive Argument for Reducing Immigration into the United States. I am an affiliated faculty member of CSU’s School of Global Environmental Sustainability and past president of the International Society for Environmental Ethics.

Recently I recorded the first season of a new TV show called The Population Factor, airing on the Internet TV network Earthx TV. This show aims to become the spot for honest and probing discussion of population issues in the English speaking world. Check out our first seven episodes streaming for free, including episode 1 with environmental legend Paul Ehrlich and episode 7 on rewilding and population.

For the past three years, Swedish ecologist Frank Gotmark and I have been co-principle investigators on a new effort, The Overpopulation Project, headquartered at the University of Gothenburg, Sweden. With help from a generous grant from the Global Challenges Foundation, we have been studying the environmental impacts of overpopulation and exploring humane policies to end population growth around the world. Initial publications include:

"Population growth and climate change: Addressing the overlooked threat multiplier." J. Dodson, P. Dérer, P. Cafaro and F. Götmark. Science of The Total Environment 748 (2020): 141346.

"Policy-based Population Projections for the European Union: A Complementary Approach.” P. Cafaro and P. Dérer. Comparative Population Studies 44 (2019): 171-200.

Aging Human Populations: Good for Us, Good for the Earth.” F. Götmark, P. Cafaro and J. O’Sullivan. Trends in Ecology and Evolution 33 (2018): 851-862.