John Perlin is the author of A Forest Journey: The Role of Trees in the Fate of Civilization. He has also written three books on solar energy: A Golden Thread: 2500 Years of Solar Architecture and Technology; From Space to Earth: The Story of Solar Electricity; and Let It Shine: The 6000-Year Story of Solar Energy, as well as a visiting scholar in the department of physics at UC Santa Barbara. John emphasizes the mitigation of climate change by renewing our symbiotic relationship with the trees that have sustained us.