In California’s fourth climate change assessment, the Sierra Nevada region is huge, extending along the eastern edge of the state from the Oregon border all the way down to Death Valley in the southeast. It includes 14 entire counties, plus the eastern parts of 4 others. The discovery of gold here in the mid-1800s led to many thousands of people pouring into the area, but today only 3% of it is cities or agricultural areas. The remaining 97% is grasslands, shrublands, forests, and, in the south, high desert. Four young people spoke with me and helped me understand how climate change is likely to affect day-to-day life in this region.