Dr. Bruce Tonn is an associate professor in the School of Planning at the University of Tennessee, Knoxville, and a senior researcher at Oak Ridge National Laboratory. He is known for his writings on potential futures (including 500-year planning and the voices of future generations) as well as issues and research in environmental and energy policy. In a recent essay entitled "Transcending Oblivion," he argues that a primary guiding vision for Earth life should be to emigrate from Earth and our solar system before the sun dies.