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In conjunction with “One Book, One Northwestern,” another Science Café has been added to the roster. At 6:30 p.m. on Oct. 7 at the Celtic Knot Public House, Kimberly Gray, professor of civil and environmental engineering at Northwestern University, will present “What Will Finally Spark That Green Revolution?”

Transition to the new green economy is under way, but, asks Prof. Gray, “Are the types of changes in design, production and products doing more than assuaging consumer guilt? Will dramatic improvements in energy efficiency really reap huge ecological benefits?” One proposition is that while the green mantra, “innovate,” holds some promise for the green revolution, there may be as much opportunity in the idea of an “heirloom economy” and the notion “to leap forward, think backwards.”

The Celtic Knot is located at 626 Church St. Seating is on a first-come, first-served basis; space is limited to 50 people.

To see the entire lineup of science cafés, go to http://www.sciencecafe.northwestern.edu.