PORTLAND, Maine (AP) -- Clocks may not be the only thing falling back: That signature autumn change in leaf colors may be drifting further down the calendar.
Scientists don't quite know if global warming is changing the signs of fall like it already has with an earlier-arriving spring. They're turning their attention to fall foliage in hopes of determining whether climate change is leading to a later arrival of autumn's golden, orange and red hues.
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The leaves, they are a-changing _ even as scientists try to log climate's impact on colors
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