By Tim Radford
LONDON - Appalachian spring - and springtime in the Rockies, and mountain greenery too - will tune up a little earlier: up to a month earlier, according to new studies from the United States.
Scientists report in the journal Geophysical Research Letters that careful analysis of observations of budburst - that promising moment near the end of winter when green shoots begin to appear on trees - show that spring could arrive dramatically earlier by the end of this centure.
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