Book excerpt: This book is to help instructors achieve three important goals: first, to explain to their students the basics of earth science, including how life on the earth has survived for billions of years; second, to help students to use this scientific foundation in order to understand the multiple environmental problems that we face and to evaluate possible solutions to them; and third, to inspire their students to make a difference in how we treat the earth on which our lives and economies depend, and thus make a difference in how we treat ourselves and our descendants.