Sometimes referred to as nature's calendar, phenology looks at the seasonal life cycle of plants and animals and is one of the leading indicators of climate change. It's the observance of natural occurrences like the first formation of buds and flowers in the spring and the changing colors of leaves in the fall. According to researchers at the University of New Hampshire, when the rate of the Earth's air temperature slows down for a significant amount of time, so can phenology.
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