Environmental Science

Cinnabar's bright-red pigment has been used in jewelry, pottery and makeup for millennia. But cinnabar is also the primary ore for mercury, making it a dangerous mineral if the particles are inhaled.

By Allison Troutner

There are caves all over the world, but some are in places that are hard to explore — hidden by rocks, ruins or even under ice. We've found seven secret caves you probably never knew existed.

By Stephanie Parker

From the chemicals that pollute and the massive use of water, the traditional method of dyeing blue jeans is an environmental disaster. Nanoparticles made from wood pulp might be the answer to the problem.

By Jesslyn Shields

The science is off the charts. Climate change is here and it's affecting the planet. We'll tell you how and where.

By Betsy Weatherhead

Critics warn that cryptocurrency networks, whose computers use enormous amounts of electricity to verify transactions, could be a factor in warming the planet. The industry is working to change that.

By Patrick J. Kiger

A new project aims to document the possible demise of Planet Earth due to climate change. It's called Earth's Black Box and the creators hope this will be a warning to all Earth-dwellers to take global warming seriously.

By Joanna Thompson

A new report released by Beyond Plastics suggests that plastics will release more greenhouse gas emissions than coal plants in the U.S. by 2030.

By Elizabeth Claire Alberts

In the lead-up to U.N. Climate Change Conference, the Swedish activist talked about Biden's climate plan, the media's responsibility and what gives her hope.

By Mark Hertsgaard

The waters of the Atlantic and Pacific oceans meet at the tip of Cape Horn and never the two shall mix, right?

By Jesslyn Shields

The Atlantic Meridional Overturning Circulation, or AMOC, plays an essential role in regulating ocean temperatures, but it looks as if it may be collapsing. What happens next?

By Joanna Thompson

This ancient rock adorns King Tut's coffin and the Sistine Chapel. And at one time it was more precious than gold. What is it about this deep blue rock that has drawn us in for centuries?

By Carrie Whitney, Ph.D. & Austin Henderson

It's possible that the giant, deadly serpent hanging out at the bottom of Fosse Dionne spring is just a legend, but divers have disappeared trying to find out, so who knows?

By Jesslyn Shields

The curves of the Serpent Mound, Ohio state's massive and mysterious geological wonder, line up with the sun during equinoxes and solstices.

By Jesslyn Shields

The rose-red mineral rhodonite was first discovered in the 1790s in the Ural Mountains of Russia. Today it's found globally and is associated with compassion, love and healing.

By Allison Troutner

This alien-looking archipelago off the coast of Yemen is teeming with plants and animals. Many species here are threatened or endangered. Can they be saved?

By Stephanie Parker

Waterfalls are mainly reliant on precipitation to keep flowing. Here are six famous waterfalls that slowed to a trickle when drought set in.

By Laurie L. Dove

Desalination has long been considered too expensive and too energy-intensive to make much sense. But with newer technologies, that line of thinking is changing. What are some of the most interesting desalination projects on the planet?

By Jessika Toothman

Anthropologists specialize in, well, us. But studying humankind doesn't mean you have to hole up in a library or laboratory. Take a peek at this article to learn more about the dynamic, enriching field of anthropology.

By Nathan Chandler

When it comes to fossils, specimens like Sue the Tyrannosaurus rex grab much of the attention. And while Sue is a staggering 67 million years old, she's a new kid on the block, compared to some of the oldest fossils ever found. What's older than Sue?

By Jonathan Atteberry

Archaeologists dig up and study the material remains of human civilizations. Bioarchaeologists do the same thing, except they focus on the remains of, well, us. What's the big deal about old bones and teeth?

By Nathan Chandler

Could solar cells be the asphalt of the 21st century?

By Patrick E. George & Cherise Threewitt

We live in a universe of clocks. The technology may not sound as dependable as your cell phone alarm clock, but humans have turned to water-powered clocks for more than three and a half millennia.

By Robert Lamb

You know what geothermal energy is -- heat from the Earth. Could a new twist on geothermal power help countries achieve energy independence?

By Susan L. Nasr

Without a doubt, plastic is useful. It's also everywhere — filling up landfills and recycling bins. These 10 twists on the common polymer are trying to change that reality.

By Maria Trimarchi, Patrick J. Kiger & Vicki M. Giuggio

Plants produce energy so perfectly: converting sunlight, carbon dioxide and water into power and emitting nothing harmful in the process. Can we imitate such an elegant system?

By Julia Layton & Yara Simón