If you think the car you drive or the light bulbs you buy are your biggest contributions to global warming, Dr. Robert Lawrence says, "Think again." Lawrence heads the Center for a Livable Future at Johns Hopkins University. When he speaks at UNC-Charlotte today, he'll tell the audience it's not only what thye drive, but what they eat that's warming the globe. He spoke with WFAE's Julie Rose: Dr. Robert Lawrence is director of the Center for a Livable Future at the Johns Hopkins University Bloomberg School of Public Health. He will offer a free seminar today at 2 p.m. at the UNC-Charlotte College of Health and Human Services.