ASPEN, Colo. (AP) - A mysterious malady has killed off nearly one-fifth of Colorado's aspens. But forest ecologists have struggled to explain the widespread die-off, known as Sudden Aspen Decline. The ...

ASPEN – An Aspen homeowner and a landscaper he enlisted to prune limbs from a neighbor’s tree were both fined $550 by the city of Aspen as part of an agreement announced Wednesday in Municipal ...

GUNNISON, Colo. Aspen trees, with their quivering, delicate foliage and the warm glow of color they spread across the high country of the Rocky Mountains this time of year, have an emotional appeal ...

Gray wolves were reintroduced in Yellowstone National Park in 1995 to help control the numbers of elk that were eating young trees, and it is finally paying off for quaking aspen. Yellowstone's wolves ...