In a real sense, the evolution of his thinking on these complex problems are reflected in the series of books he has written over the years, culminating in the 2023 book "Commanding Hope", based on a theory of hope:
- Environment, Scarcity, and Violence (Princeton, 1999). - a book showing how other factors combine with environmental stress to produce violence.
- “The Ingenuity Gap: Can Poor Countries Adapt to Resource Scarcity?,” which appeared in Population and Development Review in 1995
- “Resource Scarcity and Innovation: Can Poor Countries Attain Endogenous Growth?" ?” coauthored with Edward Barbier, which appeared in Ambio (1999)
- The Upside of Down: Catastrophe, Creativity, and the Renewal of Civilization (2006), examined the threat to global stability of simultaneous and interacting demographic, environmental, economic, and political stresses. This led to examining energy as a major factor in our modern society.
- "Commanding Hope: The Power we have to Renew a World in Peril"