The 2015 Sierra Nevada snowpack is at a 500-year low Valerie Trouet Soumaya Belmecheri | 15th September 2015 The lack of snow in California's Sierra Nevada is historically unprecedented, write Valerie Trouet & Soumaya Belmecheri. It's also seriously bad news for the state's water supplies - and may be an indicator of even worse to come in a warming world.
