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Yesterday was the first day of autumn. Our Alberta family members reported beautiful yellow trees in their park. Thursday’s harvest moon was spectacular in Northern California according to our nature-loving middle child. Our youngest said it was raining in Berkeley, a typical fall day there. Just like here.

Two falls ago we were in New England where the leaves were in full display. Yellows, oranges, reds. A magnificent canvas painted across the Berkshire hills.

Watercolor Autumn © SR Euston

Watercolor Autumn
© SR Euston

But all is not well in leaf land. According to a 23-year study of the Harvard, MA Forest, fall colors now arrive three to five days later, correlating with the 2° Fahrenheit rise in average Northeast temperatures.

So what? The leaves will just start changing later. Except…leaves also change color based on day length. It’s the combination of shortening days and turning colder nights that alert the trees they need to begin preparing for the long winter ahead by ceasing to create sugars with the green chlorophyll in their leaves. As the green fades, the underlying yellow pigment begins to show through. Ultimately the leaves dry and fall.

Not so with the red pigment, anthocyanin, which is actually produced as a result of cool nights and sunny days. As those conditions change, the most noticeably affected may be the glorious bright red sugar maple. Not only may they no longer be in suitable habitat as the climate changes, they’ll like produce fewer of their signature red autumn leaves.

Not only is this a heartbreaking loss for those who relish a red sugar-maple-colored fall, it’s not great economic news for the leaf-peeping tourist trade in a swath across the Midwest to the Northeast and south to the Piedmont, an estimated $25 billion per year economic engine.

Guess climate alteration isn’t just for polar bears and ice caps anymore. Seen any good leave change recently? Seems we’ll need to grab the chance while we still can.

Autumn Leaves © SR Euston

Autumn Leaves
© SR Euston

For more info see: http://biology.appstate.edu/fall-colors/will-global-climate-change-affect-fall-colors

and: http://des.nh.gov/organization/commissioner/pip/factsheets/ard/documents/ard-25.pdf

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