EDITOR’S NOTE: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet initiative has ...

Ancient trees may have played a key role in regulating Earth's climate during the last ice age—by 'breathing' less efficiently. The researchers found that as temperature and CO 2 levels dropped, trees ...

A startup called American Castanea has joined the quest to revive the American chestnut tree, the first step in its plan to give forests a genetic upgrade. Under a slice-of-heaven sky, 150 acres of ...

Very few people alive today have seen the Appalachian forests as they existed a century ago. Even as state and national parks preserved ever more of the ecosystem, fungal pathogens from Asia nearly ...