The human cost of war is often easy to measure, but there is another impact of warfare that is far less obvious, but just as deadly. The environmental effects of war will be the subject of a free lecture by Brenau University professor Gnimbin Ouattara set for 4-6 p.m. Wednesday, March 13, in Thurmond McRae Auditorium, part of the lecture series, "Sense & Sustainability." A question-and-answer session will follow.