Scientist finds Jeffrey pine trees at record mountain heights, suggesting climate-driven shifts in Sierra Nevada.

Busting myths; how a drop of water changed a girl’s life; a tribe’s respect for fishes; and more: picks from columnist.

I know from experience that being outdoors helps kids feel less irritable and sleep better. But don't take my word for ...

Photographer Mitch Epstein's years-long project highlights the majesty and vulnerability of old growth forests across the US ...