The world may still have gold and myrrh, but it’s quite possible that frankincense could become a thing of the past, given ecological pressures on the arid lands where it grows in Ethiopia.

The storied resin—known to millions as one of the three gifts of the Magi, the wise men who visited Jesus after his birth—is made from gum produced by the boswellia papyrifera tree. Its “bitter perfume” is used as incense in religious rituals in many cultures, as well as an ingredient in perfume and Chinese traditional medicine.

Dutch and Ethiopian researchers studying populations of the scraggly, scrublike trees in northern Ethiopia found that as many as 7 percent of the trees are dying each year, and seedlings are not surviving into saplings.

Their paper in Tuesday’s (Dec. 20) edition of the Journal of Applied Ecology finds that the Ethiopian trees that produce much of the world’s frankincense are declining so dramatically that production could be halved over the next 15 years, and the trees themselves could decline by 90 percent in the next 50 years.

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