Scientists studying Sierra Nevada weather rely on modeling and readouts from monitoring stations sprinkled throughout the vast Sierra Nevada range. But recently they have been cultivating a powerful news source of data—thousands of citizen scientists eager to contribute their observations to climate projects....

Anyone who was in the Tahoe region in August 2019 saw butterflies—lots of them. Insects are good at capitalizing on favorable weather and food availability, and last year, conditions were perfect for California tortoiseshells....

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