With gold prices hitting $1,500 per ounce, an all-time record, take a look at the true cost of this precious metal.
The tiny insect can turn entire pine forests into bleak landscapes.
This icon of the Mojave desert could be yet another victim of climate change.
The Yellow-billed Continga is among many species in danger of vanishing before anyone learns fundamental facts about them.
By piling mounds of fish remains, turtle bones and other waste, ancient people helped create the Everglades.
Biodegradable plastics, electronic components and clothing are gaining ground.
Warming temperatures make the towering lodgepole pine tree vulnerable to drought and pests.
The forest nitrogen cycle begins with 100-year-old trees and the moss that grows on them.
After circling the moon as seeds, so-called "moon trees" are now in our midst, but their locations are a mystery.
A 1,238-year-long tree-ring chronology suggests drought may have had a hand in Mexico's history.