Phi Beta Kappa Visiting Scholar James Zachos, professor of Earth & Planetary Sciences at University of California Santa Cruz, will speak Thursday, Jan. 25 at 5:30 p.m. in Plyler Hall, Patrick Lecture Hall. His talk, “Greenhouse Warming in Deep Time: Lessons for the Future,” is free and open to the public. Zachos’ visit is hosted by the Furman Department of Earth and Environmental Sciences.