Register for an account


Enter your name and email address below.

Your email address is used to log in and will not be shared or sold. Read our privacy policy.


Website access code

Enter your access code into the form field below.

If you are a Zinio, Nook, Kindle, Apple, or Google Play subscriber, you can enter your website access code to gain subscriber access. Your website access code is located in the upper right corner of the Table of Contents page of your digital edition.


The 5 Most Creative Ways to Clean Up Pollution

Sometimes, two kinds of messes can cancel each other out.

By Karen RowanJune 28, 2008 12:00 AM


Sign up for our email newsletter for the latest science news

We bury them underground, drown them in lagoons, or shove them out to sea—no matter how remote a site, it may be full of the toxic by-products of modern life. Nuclear waste and heavy metals are just some of the noxious residue of our everyday existence. To reverse the damage, scientists turn to both innovative technologies and peculiar organisms.

Chlorine Cuisine

 If they make their way into the groundwater, chlorinated wastes, like those found in dry-cleaning fluids and paint thinner, can cause liver problems and cancer in people. But some bacteria find these chemicals quite palatable: When Dehalococcoides ethenogenes comes in contact with the chemicals, it feasts on chlorinated compounds, converting them into harmless gases.

Fly Ash Bricks 

In the process of generating electricity, U.S. coal plants spew more than 70 million tons a year of a radio­active waste called fly ash. Now a Missouri company has found a way to turn the ash into bricks, an innovation that reduces fly ash while providing an extra benefit: The bricks soak up toxic mercury from the air.

Purging Pesticides

White rot fungi, common in the forests of North America, use special enzymes to convert the carbon in trees to energy. These same enzymes can oxidize environmental pollutants such as pesticides and PCBs, rendering them benign.

Flushing Iron 

Metal toxins commonly found at mining sites could be treated with the stinky remains of human wastewater. The human waste, rife with iron, would be especially useful if dumped at sites loaded with cadmium, lead, and arsenic. The iron would readily react with the other metals and keep them from dissolving into nearby groundwater.

Plutonium Pyramids 

Hematite, a shiny black mineral sometimes used to make jewelry, can soak up plutonium and uranium waste from nuclear plants. Scientists recently found that hematite crystals placed in acid grow pyramid-like structures on their surface. As the structures form, contaminants can settle into tiny pockets in the hematite crystal, where they could remain stable for hundreds of years.

3 Free Articles Left

Want it all? Get unlimited access when you subscribe.


Already a subscriber? Register or Log In

Want unlimited access?

Subscribe today and save 50%


Already a subscriber? Register or Log In