It sounds unbelievable, but every tree on the planet, from ancient mountain pines to the flowering ornamental trees growing in city parks, belongs to just three major categories. Despite the thousands ...

The presence of non-native trees is often seen as an obstacle to the recovery of tropical forests regrowing in previously ...

The study also shows that nearly 41% of so-called naturalized tree species—species that do not naturally occur in a given area but now grow wild there—possess traits such as fast growth and small ...

Add Yahoo as a preferred source to see more of our stories on Google. Getty Images There's a reason it's called the Mighty Oak: Oak trees are stately trees that can live for hundreds (yes, hundreds!) ...

The urgent race to save North America’s iconic trees imperiled by invasive pests and pathogens. In waves across the land, some of North America’s iconic tree species are dying from a myriad of ...

The Watterson Expressway, also known as Interstate 264, is eight lanes wide where it cuts through the south side of Louisville, Kentucky, and for a long time, the only thing separating the area’s ...