A single aspen colony in Utah called Pando covers 106 acres, weighs 6,000 tons, and is genetically one organism connected by a root system that may have been alive for 14,000 years and is now slowly being eaten to death by mule deer

Crouch down in the understory at Pando and the story is in the soil. Aspen suckers, finger-thin and pale, push up from the root mass and are immediately bitten off at ankle height. Then the next...