Discarded Christmas trees, a gift to Stockholm's fish

On a freezing January morning, dozens of discarded Christmas trees collected after the holidays are tossed into Stockholm's glacial waters, recycled to provide a welcoming habitat for marine life.

NGC 2264: Telescopes illuminate 'Christmas tree cluster'

This new image of NGC 2264, also known as the "Christmas Tree Cluster," shows the shape of a cosmic tree with the glow of stellar lights. NGC 2264 is, in fact, a cluster of young stars—with ages between about one and five ...

Rent-a-tree firm helps Londoners have a sustainable Christmas

On a crisp, winter's day at a London scout center, seasoned customers picked their way along muddy rows of Christmas trees in pots labeled with their names while newcomers mulled over which one to rent. "It's a big decision", ...

World's longest lichen declines in a national park

A unique long-term study performed by researchers at Umeå University shows that the pendent lichen Usnea longissima has decreased by 42% over 37 years in Skuleskogen National Park, located in High Coast UNESCO World Heritage ...

How a lone 'immigrant' wolf revived a forest ecosystem

In 1997, a lone wolf crossed an ice bridge that briefly connected Canada with the remote Isle Royale, which lies off the coast of Michigan in Lake Superior and is renowned for its rich biodiversity.

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