TARANTO, Italy -- Farmers in a region of Italy once known for cheeses have turned to cultivating a type of cannabis -- not to smoke or sell -- but to decontaminate polluted soil.

The hemp they’re growing contains very little THC -- the compound that makes people high.

Vincenzo Fornaro showed CBS News an empty farm, once packed with more than 600 sheep.

“For generations, our family produced ricotta and meat,” Fornaro recalled.

It wasn’t until 2008 when Italy’s government discovered the toxic chemical dioxin in his sheep and slaughtered the entire herd. The culprit was just a mile away.

Contaminants spewing from a massive steel plant -- Europe’s largest -- meant Fornaro could never have grazing animals again. To clean up his land he decided to try a rather unusual experiment.

Fornaro planted industrial hemp to try to leach contaminants from the soil.

Vincenzo Fornaro is using industrial hemp to help decontaminate the soil on his farm caused by a nearby factory. CBS News

The science is called phytoremediation -- a process where contaminants are absorbed by the fast-growing roots of the cannabis plant which stores or, in some cases, transforms toxins into a harmless substance.

“You think this marijuana is the future of your farm?” Doane asks Fornaro.

“Yes, absolutely,” Fornaro said.

This graphic shows how a hemp plant decontaminates the soil in a process called phytoremediation. CBS News

Although Fornaro’s crop is past harvest and doesn’t look like much now, phytoremediation is proven to pull heavy metals from soil.

It was used following the nuclear disaster at Chernobyl to remove radioactive strontium and cesium.

Cannabis’ future

Claudio Natile sells some of the thousands products made from industrial hemp including hemp oil, beer and pasta.

“We want to eliminate the prejudice against cannabis,” Natile said.

He took CBS News to an apartment complex built from hemp composite materials. So passers-by don’t miss the point, the grass out front is cannabis.

This apartment building -- with cannabis out front -- is built with hemp composite materials. CBS News

“We must innovate,” Fornaro told CBS News, “and develop in a way that’s ecologically sound.”

It’s in the shadow of the steel factory in Italy that Fornaro is pegging his future to a very different type of plant.