After deadly season, new rules would limit who can climb Mount Everest

Hundreds of hikers battle altitude sickness and frostbite as they wait in line to summit Mount…

12 spectacular images from NASA's Spitzer telescope

The Spitzer Space Telescope is so sensitive it can see objects optical telescopes cannot. Here are…

Costa Rica has doubled its forest cover in the last 30 years

After decades of deforestation, forest cover in Costa Rica is on the upswing, now covering half…

Do you know the keys to longevity?

From exercise and coffee to diet and pets, see how much you know about longevity.

3 new Dark Sky Parks reveal wonders of the night sky

The International Dark-Sky Association bestows the honor on national parks and monuments that limit light pollution…

3 new Dark Sky Parks reveal wonders of the night sky

The International Dark-Sky Association bestows the honor on national parks and monuments that limit light pollution…

Two-thirds of sunscreens offer inferior protection, says EWG

Environmental Working Group's newest sunscreen guide rates the safest sunscreens and calls out bad practices (like…

EWG Board Member Michelle Pfeiffer Urges Congress To Reform Outdated Cosmetics Law

Why we need to worry about ozone again

A study found an increase in the chlorofluorocarbons since 2012, and this could hinder ozone recovery.

*** in the Pool Toxic or Just Gross?