Eden’s Last Horizon is a work created from the pain and sorrow of what humans are doing to the Earth. Yet is also a poem of hope and joy for the varied and magnificent places on the planet and from inside the minds of people who love it. Both manifesto and a book of praise, the volume is darkly painful and yet filled with the light of the Earth’s possible salvation. Philip Lee Williams has written about the natural world for decades, especially the science behind the Earth’s most-striking objects and places.