On a winter day in 2013, Tom Haines stood in front of his basement furnace and wondered about the source of the natural gas that fueled his insulated life. During the next four years, Haines walked hundreds of miles through landscapes of fuel on a crucial exploration of how we live on Earth in the face of a growing climate crisis. Can we get from the fossil fuels of today to the renewables of tomorrow? The story he tells is full not only of human encounters but also of the meditative range that arrives with solitude far from home. Haines writes regularly for the Atlantic and the Washington Post, and teaches at the University of New Hampshire.