Pinyon-juniper woodlands are a common sight in much of Utah. But pinyon trees are declining, while junipers are expanding.

TANNERSVILLE — Marc Wolf steps off a trail at the Mountaintop Arboretum to examine a beech tree with mottled, bumpy bark. “This is pretty typical of beech bark disease,” he said. “Beech trees would ...

Increasing heat and drought are putting our forests under stress. Researchers at the Swiss Federal Institute for Forest, Snow ...

More than a third of all tree species worldwide face extinction, threatening ecosystems, plants, animals and economies around the world, experts warned Monday. In all, 38% of trees are at risk, ...

Christmas trees are big business out West, but a hotter climate means challenges for tree growers. John Tillman owns Tillman Christmas Trees and has acres of Noble, Nordmann, Fraser, Korean and ...

From Tasmania to the Top End, Australia's forest trees are dying at higher rates due to climate change, according to new research.