SALISBURY — The Center for the Environment at Catawba College will host a presentation by David Orr, a leading expert of the American environmental movement, at 6:30 p.m. Tuesday.

His topic will be “North Carolina in a Hotter, Less Democratic Time … Unless,” an examination of how democracy is changing and how this interrelates with climate change and efforts to lower its future impact.

John Wear, director of the Center for the Environment, said Orr will focus on North Carolina in a presentation that is both important and timely.

Admission is free, but registration is required at www.catawba.edu/orr.

Orr is a scholar, teacher, writer, speaker and entrepreneur whose diverse fields include environmental issues and politics, environmental education, campus greening, green building architecture, ecological design and climate change.

Orr is a Paul Sears distinguished professor of environmental studies and politics emeritus.

He is the author of eight books, including “Dangerous Years: Climate Change and the Long Emergency” (Yale, 2016) and “Down to the Wire: Confronting Climate Collapse” (Oxford, 2009). He is the co-editor of three others books.