Steven Earle, PhD, has developed and taught university earth science courses for over four decades. He is the author of A Brief History of the Earth's Climate and the widely used t...view moreSteven Earle, PhD, has developed and taught university earth science courses for over four decades. He is the author of A Brief History of the Earth's Climate and the widely used textbook Physical Geology. A dedicated community activist, he champions climate change solutions in areas such as low-carbon transportation, home heating, and land stewardship.view less