Global warming presents a new and growing threat to lands where deer and antelope play. Droughts across the mountains and plains of Wyoming can cut the spring growing season from four months to two. That dries up nutrient-rich green grasses and shrubs just when they are needed most by migrating mule deer to replenish body fat after the winter, and to rear their young.

The chemical plants that make up the Louisville neighborhood known as Rubbertown have been around since World War II, when the federal government selected the city to satisfy an increased demand for rubber.