Greg Croft knows that when it comes to oil, reducing consumption reduces problems. As a Lecturer at the Earth and Environmental Sciences Department of St. Mary's College of California, Croft assesses global oil and coal resources and researches the economic realities of producing liquid fuel from coal. Croft's recent work on global coal resources suggests that the world's coal mining production capacity will decline in the near term.

Croft's work has appeared in the New York Times.