Spring signs - respect for phenology

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Listen: Spring signs - respect for phenology
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Every spring for thousands of years, people have noted the first leaf buds opening, the first insects hatching, and other signs of the changing seasons. The study of seasonal plant and animal activity is called "phenology."---a field which in the past has often been dismissed as old fashioned. Now, scientists realize such observations can be a valuable tool for studying global climate change.

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