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Flora of the United States

White Mountains — Pines

Tree species are leap-frogging up mountains in reaction to climate change

Environment

Researchers studied two species of pine that live at the tree line and found them moving up rather rapidly — with one species leapfrogging another in the competition for new real estate.

A photo of Pando in the fall at Fish Lake National Forest.

Earth’s biggest living thing might be a tree with thousands of clones

Science
Mike Adams is the owner of Royalty Pecan Farm in Caldwell, Texas. Most of the nuts pictured here are being prepared for export to China.

The Chinese went wild for American pecans — which may be bad news for wild pecan trees

Business
Conservation volunteers at the Boston Harbor Islands National Park.

Conservationists fight off invasive species at Boston’s Harbor Islands

Environment
A man, bundled up against the cold, walks past a street vendor's chestnuts as they roast in front of the Metropolitan Museum of Art in New York.

How to make sure those are American chestnuts roasting on your fire

Science

The World’s Largest Known Organism In Trouble

The world’s largest and possibly oldest living organism is Pando, a Quaking Aspen clone living in Utah. Best guesses place it at 80,000 years old but over grazing from deer and elk are threatening its existence now.

What’s behind the grizzly bear attacks in Yellowstone?

Environment

Grizzly bears killed two people last year in Yellowstone National Park. After 24 years of no deadly encounters, many people were left wondering what caused the fatal attacks. Some said global warming had depleted the bears’ normal food sources. Others say the answer is much simpler.

Famous tree-lined French Canal du Midi in danger of losing all its trees

Environment

The 42,000 plane trees lining France’s historic Canal du Midi are being felled because of a fungus brought to Europe by US soldiers in World War II. Will the planes that decorate the streets of cities such as Paris and London share the same fate?

The World’s Largest Known Organism In Trouble

The world’s largest and possibly oldest living organism is Pando, a Quaking Aspen clone living in Utah. Best guesses place it at 80,000 years old but over grazing from deer and elk are threatening its existence now.

Dying Yellow Cedars

Scientists solve a century old mystery when they discover what is killing yellow cedar trees in the Pacific Northwest.