Climate scientists agree that the world’s climate is changing. The effects of global climate change will pose many challenges to the environment, economies, and communities of both California and Nevada over the coming decades. For example, by mid-century spring snowpack in the Sierra Nevada is projected to decline by 25 to 40 percent. Toward the end of the century, losses could reach 75 to 90 percent. The depletion of snowpack is alarming because the Sierra Nevada is home to 24 major watersheds that provide up to 65% of California’s developed water supply and almost all of Northern Nevada’s.