Colorado's unique landscape, from rolling prairies and shrublands, woodlands and mountain forests and alpine tundra is home to hundreds of species of plants and animals. The Nature of Colorado includes a memorable essay by James C. Rettie, who worked for the National Forest Service in 1948. In a flash of brilliance, he converted the statistics from an existing government pamphlet on soil erosion into an analogy for the ages. His essay inspires...