After a closet cleanout, what options are there for recyling our old threads? Not many. Apart from bringing used clothes to a donation center, there is no process for recycling textiles like there is for bottles and cans. And, the average American throws out around 81 pounds of clothing each year. That amounts to more than 11 million tons of textiles that end up in the landfill or incinerator. 

But MIT engineers hope to cut down on the growing mountain of textile waste, with a new, recyclable yarn. 

The team has designed a yarn made from a form of plastic that is commonly used in milk bottles and grocery bags. The new yarn, which has a feel similar to traditional sewing thread, can be woven into stretchy, lightweight clothing. The researchers say that at the end of its use, a yarn-spun garment could be melted down and redrawn into new yarn, and then woven into new clothing or even cast into buttons, belt buckles, and other plastic accessories.

To demonstrate the yarn’s recyclability, the researchers spun a spool of yarn, melted the yarn down, and respun it into new yarn, multiple times. They found that even after 10 cycles, the yarn was as strong and flexible as conventional thread. 

They envision the new yarn could be an alternative to elastic spandex-polyester or spandex-nylon yarns, which are spun from a combination of fibers that cannot be recycled together. The team’s new yarn, in contrast, is made from a specific combination of plastic materials that mimics the tough and stretchy properties of spandex yarns, while also being easily recycled. 

“Eighty percent of textiles on the U.S. market currently contain some amount of spandex, which makes them nonrecyclable,” says Svetlana Boriskina, a research scientist in MIT’s Department of Mechanical Engineering. “There’s no widely adopted technology now that recycles textiles into textiles. With our new yarn, we hope to change that.”

Boriskina and her colleagues have published the details of the new yarn in a study published in the journal ACS Materials Letters. MIT co-authors include first author SeongHyeon Kim, Duo Xu, Volodymyr Korolovych, Domingo Flores-Hernandez, Kaniz Moriam, and Daniel Braconnier.

The core of the problem

Spandex is a polyurethane-based synthetic fiber that is springy but not very strong. A thread of an elastic yarn is made from two parts: a spandex-based core, surrounded by a sheath of tough polyester or nylon. The combination of these materials gives elastic yarns their unique stretch and strength. 

But this same material mixture makes elastic yarns nearly impossible to recycle. Yarns would first have to be chemically treated to separate the polyester sheath from the spandex core. The polyester-based sheath material could then be melted down and reused. But there is no way to recycle the yarn as a whole, without chemical separation.

“Even though chemical separation technologies exist, they add extra cost and complexity, and usually require toxic chemicals that are harmful to the environment,” Boriskina says. “That’s why most stretchy garments go to the dump.”

In 2021, Boriskina’s group developed a new type of yarn made from polyethylene. Polyethylene is the most common type of plastic in the world, used to make everything from grocery bags, water bottles, trash bins, and toys to industrial pipes and plastic sheeting. Polyethylene is a thermoplastic, meaning that it can be melted down and remade, and thus recycled. 

And yet, polyethylene had never really been considered as a textile. In their previous work, Boriskina and her colleagues showed they could spin yarn out of polyethylene, which they then wove into various garments. In those experiments, they focused on the yarn’s moisture wicking, stain-resisting, and cooling properties. 

Spaghetti yarn

In their new study, the group aimed to tailor polyethylene yarn to mimic the strength and flexibility of spandex; they also sought to demonstrate the yarn’s recyclability. 

They first looked for formulations of stretchy, polyethylene-based copolymers that resemble a spandex elastic core. Separately, they engineered polyethylene yarns that can act as the sturdier sheath. Looking through the scientific literature and combing through industrial reports, the team evaluated many chemical variations of polyethylene.

“The chemical structure of polyethylene is like Christmas garland — a backbone of carbon, carbon, carbon, and also these dangling ‘decorations’ of hydrogen atoms or short branches with the same structure as a backbone,” Boriskina explains. “How these chains are arranged can change the properties of the whole structure.”

“Polyethylene can give us a wide range of properties, depending on how you make it,” adds first author SeongHyeon Kim.

For the yarn’s core, the team used one polyethylene-based resin that results in a more stretchy fiber. They chose a second, stiffer resin as the basis for the yarn’s sheath. The researchers obtained pellets of each resin from a chemical manufacturer, and then put each type of pellet through a process of fiber fabrication, first pouring them into a hopper, then heating the pellets to about 350 degrees Fahrenheit, past their melting temperature. The melted polyethylene was then drawn through small extruders to make hair-thin fibers. 

“You just melt it in a barrel with a heater, and then you extrude and spin it into fibers,” Kim says. “It’s like a spaghetti machine.”

The team used an industrial yarn spinner to wind the sheath fibers around a core fiber to make the final, elastic yarn. 

Because both the yarn’s core and sheath come from the same chemical family of polyethylene, Boriskina says the materials do not have to be separated before recycling, in contrast to spandex-based elastic yarns. The new yarn can be melted as is, and reformed into new yarn or other plastic products.

“Because they are exactly the same chemistry, they play nicely together,” she says. “That’s what makes this yarn very recyclable.”

As a demonstration, the team twisted an elastic core-sheath yarn, then melted it down and re-spun it, 10 times. Each time, they tested the yarn’s mechanical properties by precisely stretching a thread and measuring the pulling force at which the thread eventually broke. From these tests, they found that the yarn’s recycled versions were just as strong as the original sheath yarn. These recycled yarns can now be used to make new stetchy yarns by twisting them around a newly spun elastic core.

“Now we have something that can be knitted and woven,” Boriskina says. “That is the next stage.”

The team says their new recipe for polyethylene yarn can be scaled up into industrial-sized spools. Just like conventional spandex fibers, it would take kilometers of yarn to weave a single textile. But once woven and used, the team envisions that a polyethylene garment could conceivably be dropped in a recycling bin and sent to a facility to be melted down and respun, enabling a more sustainable, circular fashion and textile economy. 

“Hopefully it will prevent the need for making more and more textile materials, because you can keep recycling a large portion of it,” Boriskina says. 

This work was supported in part by the DEVCOM Soldier Center through the U.S. Army Research Office, the Office of Naval Research Global via Tecnologico de Monterrey, and the MIT Portugal Program.

Yet another Israeli mass surveillance company:

Made by Israeli surveillance company Cognyte, the tech simulates a mobile phone tower, which forces nearby phones to connect to it. That enables cops to keep tabs on any phones in the vicinity ­ whether they’re owned by a suspect in a case or not. Cognyte’s contract with the state of Texas reveals that the simulator, called FalcoNet, can be concealed within the vehicles, hidden in a backpack for on-foot missions or attached to a helicopter. It’s the same technology as the infamous Stingray, one of the original cell-site simulators made by defense giant L3Harris...

The power giant’s move to buy Dominion Energy reflects its plans to become the utility of choice at the epicenter of the AI boom.

Poor countries in Africa and South Asia don't have the resources to expand access to air conditioning as extreme heat increases.

Part of the EU executive’s recent proposal puts controls on free carbon allowances, only releasing 80 percent to companies after they provide a decarbonization plan.

The announcement comes after a group of Ashaninka Indigenous leaders began meetings with federal officials seeking urgent protection for their territory.

The objective is to determine if a newly acquired sample of gold comes from a protected area, meaning it has been illegally mined.

The project is intended to preserve the species’ population and enhance biodiversity.

Nature Climate Change, Published online: 27 July 2026; doi:10.1038/s41558-026-02698-7

The authors integrate tree species richness with satellite-derived photosynthesis proxies to show that richness correlates with greater current levels of photosynthesis and greater increases over time. Projected biodiversity loss by 2050 could lead to cumulative forest photosynthesis loss of 4.4–35.7 PgC.

Nature Climate Change, Published online: 27 July 2026; doi:10.1038/s41558-026-02692-z

Soil carbon stocks are greater than biomass carbon in boreal forests. This study shows that tree canopies thermally protect more carbon in permafrost from thaw than is stored in biomass, highlighting the need to consider carbon impacts of forest disturbance and conservation on an ecosystem scale.

Lower catch this year.

As usual, you can also use this squid post to talk about the security stories in the news that I haven’t covered.

Blog moderation policy.

For years, John Deere had actively made repairing their tractors near-impossible for anyone but itself and the few "authorized" repair shops—regardless of the ability of its customers to actually visit such shops. Now, in a major win for farmers and right to repair advocates, John Deere must soon provide farmers with not just the tools and resources to finally repair their own John Deere equipment, but also access to future updates for said equipment.

In 2025, the Federal Trade Commission (FTC) brought a suit against farm equipment manufacturer John Deere, alleging John Deere used their control over equipment repair tools and resources to limit the ability of farmers and independent repair providers (IRPs) to repair John Deere equipment. Earlier this month, John Deere reached a settlement with the FTC in which they will immediately make available a tranche of repair resources, then continue to make further resources available until the end of the year. Five states joined the FTC in this suit, and over the next 10 years these states will work alongside the FTC to ensure John Deere complies with this settlement. 

It is worth noting there is a second, farmer-initiated antitrust lawsuit against John Deere, also concerning a farmer’s right to repair their own equipment. In April, John Deere agreed to a $99 million settlement in that case, which also includes right to repair provisions.

This fight is just one example of how, as machines become increasingly computerized, companies like John Deere restrict your ability to repair machines behind software subject to legal regimes that don’t just lock down repair, but make unauthorized repair a potential criminal offense. 

John Deere’s market dominance in farm equipment led to an extraordinary power over access to the tools and resources of repair. John Deere actively restricted who had access to repair tools, and monopolized who could do the repair. This revenue stream—and control of it—is built into the business models of a lot of the technology we buy today. It also encourages companies to move away from the kinds of devices that can be easily fixed at home to ones that offer bells and whistles no one wants but makes repair difficult—like app-enabled toasters. 

This whole saga with John Deere has been an exemplar of the greater need for right to repair laws, policy, and enforcement.  There was a time when you bought a tractor and with some know-how and a manual could fix it yourself. It is easy to envision why someone with John Deere farm equipment might find it inconvenient to wait for John Deere approved repairpeople to come and fix any broken equipment. Especially when it meant waiting for days or weeks. Especially if it meant their crop was withering on the vine. This settlement will help ensure this is no longer the case. 

But it’s not just about farm equipment; If you can’t fix it, you don’t own it. While some might feel more willing to agree they “shouldn’t” futz with laptops or smartphone, it still stands that — whether it’s farm equipment, a car, a laptop, or even your phone — if you legally cannot fix it yourself, if you must go hat in hand to an “approved provider,” you are at the mercy of a corporation. It is why EFF continues to support right to repair laws that ensure people truly own what they buy. And it is why EFF continues to fight for exemptions to the law that makes it most difficult to tinker and repair your own devices.

This essay was written with Barath Raghavan, and originally appeared in The Guardian.

Major benchmarks measure what AI can do. None measure whether it does what you mean: the distance between what you ask an AI to do and the unspoken assumptions about how you want the AI to do it. We propose a new metric: the Genie coefficient.

There’s often a gap between one person’s request and another’s understanding. Most of the time, we bridge it using general knowledge. For example, if you ask a friend to get you coffee, they’ll pour a cup from the pot or buy one from a coffee shop. They won’t bring you a bag of raw beans or snatch a cup from a stranger and hand it to you. You never specified any of this. You never had to...

The Virginia Department of Environmental Quality stepped into a fight over powering AI facilities with natural gas turbines. It could shape the industry’s future.

Republicans are blasting Canadian forest management after smoke recently reached Washington.

The Texas Water Development Board's decision means the state's water plan likely won't detail data centers' usage when it is finalized in 2027.

While intense heat disrupts operations for a variety of industries, it also creates business opportunities for others.

Efforts to combat plastic waste have gotten derailed by the divide over chemical recycling.

Heat causes coral to bleach, which can be fatal if it lasts long enough.

France has been through eight ecology ministers in nine years, and Macron’s environmental policies are splitting his supporters ahead of next year’s presidential election.