By 2080, birds like the northern saw-whet owl, the scarlet tanager and the Baltimore oriole could all but disappear from Pennsylvania. Climate change is expected to shrink and shift northward the ranges of these and hundreds of other species across North America, according to a groundbreaking National Audubon Society study. Citizen science was crucial to this report. Audubon scientists relied on tens of thousands of observations from the U.S. Geological Survey’s North American Breeding Bird Survey, along with Aubudon’s own Christmas Bird Count. It combined these observations with historical climate data and climate changes predicted in the Intergovernmental Panel on...