94 Fun Facts About Recycling

Roughly what share of new steel made in the United States comes from recycled scrap?

About two-thirds: most US steel comes from electric arc furnaces fed with scrap, and steel keeps its quality through recycling far better than paper or plastic.

What term describes converting waste into new materials of lesser quality than the original?

Downcycling turns plastic bottles into textile fibre for clothing, which cannot then be turned back into bottles.

What is a recycling system called where paper, plastics, metals and containers all go in one collection bin?

Single-stream recycling puts everything in one bin and leaves the sorting to a materials recovery facility; it boosts participation but raises contamination.

What policy approach makes producers responsible for their products' entire lifecycle, including post-consumer?

Extended Producer Responsibility (EPR) is a policy that assigns producers financial and/or operational responsibility for their products' end-of-life management, promoting more sustainable product design.

What type of waste is material discarded by households or businesses after serving its purpose?

Post-consumer waste is what end-users throw away, packaging, old electronics, used paper, as opposed to scrap that never left the factory.

Who co-authored the 2002 manifesto 'Cradle to Cradle: Remaking the Way We Make Things'?

McDonough is an architect and Braungart a chemist; the model grew out of Braungart's life-cycle work in the 1990s.

What is the first step in recycling a large lithium-ion battery such as one from an electric vehicle?

Discharging it comes first: a charged pack can short and ignite, so recyclers drain the stored energy before disassembly, shredding, and metal recovery by smelting or leaching.

Approximately how many times can paper generally be recycled before its fibres are too short?

The EPA puts the limit at five to seven passes: 'After being recycled five to seven times, the fibers become too short to bond into new paper.' Some mill research argues the ceiling is higher for board grades.

Unlike paper and plastic, glass can theoretically be recycled how many times without loss of quality?

Infinitely, because glass melts back into the same glass; recyclers collect clear, brown and green separately since colour survives melting.

Recycling scrap aluminium uses roughly what share of the energy of smelting it from ore?

Because so little energy is lost, around three-quarters of all the aluminium ever produced is estimated to remain in use.

Inside the resin triangle on a PET soft-drink bottle, which number appears?

When US kerbside plastic programmes began, codes 1 and 2 were often the only ones accepted; PET is also spun into polyester fibre.

Which resin code, seen on milk jugs and detergent bottles, stands for High-Density Polyethylene?

Milk jugs, bottle caps and even plastic lumber are made from it, and it was one of the first two plastics US kerbside schemes accepted.

What aerobic process turns food scraps and yard waste into a nutrient-rich soil amendment?

Composting's microbes need oxygen, which is why heaps get turned; the result recycles organic material instead of landfilling it.

What is the common term for discarded electronics, which need special recycling for their hazardous materials?

E-waste grows with every new-model release and shrinking computer lifespan, and it holds both toxic substances and valuable recoverable metals.

What recycling method heats plastic waste without oxygen to break it into oil, gas and char?

Pyrolysis: with no oxygen present the plastic cannot burn, so heat of roughly 400-600 °C decomposes it into oil, gas and char that can be refined into fuels and chemical feedstocks.

What term covers manufacturing scrap fed straight back into production before any customer sees it?

Pre-consumer waste, such as paper trimmings or defective cans, is often not counted as recycling, since the material never left the factory.

What was the WWII practice of households handing in metal, paper and rubber usually called?

Salvage: wartime salvage drives in Britain and the 'Salvage for Victory' campaign in the United States collected household metal, paper, rubber and kitchen fat for the war effort.

Which plastic, recycling code #3, is used in pipes and window frames but rarely recycled curbside?

Roughly half the world's PVC goes into pipes, and the same material makes vinyl records.

Which plastic resin code stands for Low-Density Polyethylene?

LDPE is resin code 4, used for squeeze bottles, bread bags and film; it was the first form of polyethylene, discovered by ICI chemists in 1933.

Which heat-resistant plastic, resin code 5, is used for microwavable containers and bottle caps?

Polypropylene (PP), resin code 5, melts only around 160 °C, so it survives microwaves and autoclaves; that is why bottle caps and much medical plasticware are made from it.

Which plastic, recycling code 6, is used for disposable cups and foam packaging?

Polystyrene (PS) is resin code 6. Its foam form is so light, about 30 kg per cubic metre, that it usually has to be compacted tenfold before anyone will pay to recycle it.

Which code-7 plastic, used in CDs and older baby bottles, is made from bisphenol A?

Polycarbonate is polymerised from bisphenol A (BPA), which is why BPA leaching from polycarbonate baby bottles became a concern around 2008; CDs and DVDs are moulded from the same clear, tough plastic.

What nickname is given to the tiny pre-production plastic pellets that often wash up on beaches?

Nurdles are the lentil-sized pellets that factories melt to make plastic goods; the 2021 X-Press Pearl wreck spilled about 1,680 tonnes of them onto Sri Lanka's beaches.

What does the acronym 'MRF' stand for in the context of waste management and recycling?

Materials Recovery Facility, pronounced 'murf', is where mixed recyclables are sorted and baled for manufacturers.

Roughly what share of the lead in US lead-acid car batteries is reclaimed through recycling?

About 99%: lead-acid batteries are the most recycled consumer product in the United States, with nearly all of the lead re-smelted into new batteries.

Used cooking oil is most commonly recycled into which fuel?

Biodiesel: reacting used cooking oil with methanol (transesterification) yields fatty-acid methyl esters that burn in diesel engines, turning a waste that clogs sewers into fuel.

In the recycling world, an 'urban mine' is a stockpile of what?

Metals in discarded electronics: Japan's National Institute for Materials Science estimated the country's 'urban mine' of used electronics holds about 6,800 tonnes of gold, more than many nations' reserves.

Plastic fragments smaller than five millimetres across are classed under what name?

Microplastics are plastic pieces under 5 mm, the cut-off NOAA adopted in 2008; sunlight and waves grind floating debris into them, and they have turned up in sea salt, seafood and tap water.

In the standard waste hierarchy, which option sits at the top as most preferred?

Prevention tops the hierarchy, then reuse, recycling and energy recovery, with safe disposal last; even prevention has a limit, since every product eventually reaches an end of life.

What does the numbered triangle stamped on plastic products actually tell you?

The code tells you what the item is made of, its resin type: the US plastics industry introduced it in 1988, and a 2013 revision replaced the chasing arrows with a plain triangle.

Re-melting thermosoftening plastic into new items, without altering its chemistry, is called what?

Mechanical recycling simply washes, shreds and re-melts the plastic; doing it repeatedly is hard because polymer chains shorten and contaminants build up with each cycle.

Throwing batteries in with ordinary household rubbish raises concern mainly because they contain what?

Heavy metals such as lead, cadmium and mercury leach from dumped batteries into soil and groundwater, which is why many countries require separate battery collection.

At a modern recovery plant, plastics are separated by polymer type using what technology?

Infrared optical sorting: each polymer reflects a distinct near-infrared signature, so scanners identify PET, HDPE or PP on the belt and air jets blow each type into its own stream.

An economy built on leasing, repairing and refurbishing products to keep them in use as long as possible is called what?

Circular is defined against the linear take-make-dispose model, and the European Parliament uses almost the same wording in its own definition.

Which of these is usually NOT accepted in kerbside recycling bins, because it jams the sorting machinery?

Plastic bags wrap around rollers and force plants to stop the line, so most go to store drop-off points instead.

The earliest recorded paper recycling, in 1031, took place in which country?

Japan: in 1031 Japanese shops began selling repulped paper made from waste paper, the earliest recorded instance of paper recycling.

What is the term for deliberately designing a product with a limited lifespan to encourage replacement purchases?

Planned obsolescence: industrial designer Brooks Stevens popularised the term in 1954, and software makers do it too by dropping support for older versions to push upgrades.

Which home insulation is made mostly from shredded recycled newspaper treated with borates?

Cellulose insulation is about 80% recycled newsprint, shredded and treated with borate salts as a fire retardant, then blown into attics and wall cavities.

Which US city made separating food scraps for composting compulsory for all residents in 2009?

San Francisco: its 2009 Mandatory Recycling and Composting Ordinance required every resident and business to separate compostables and recyclables, in pursuit of a zero-waste-by-2020 goal set in 2003.

Which symbol on EU electrical goods shows they must not go in household rubbish?

A crossed-out wheelie bin is the WEEE Directive mark, required on electrical and electronic goods sold in the EU since 2005 to show they must be collected separately for recycling.

Why are people asked to rinse food containers before putting them in the recycling?

To avoid contaminating the load: a single dirty batch can send otherwise clean material to landfill, the perennial weakness of mixed collection.

What is a programme where a manufacturer collects its own end-of-life products for recycling called?

A take-back system: laws requiring producers to take back packaging, batteries, cars and electronics exist across the EU, and remanufacturing returned goods can save up to 85% of the energy of making new ones.

Rotting food and garden waste in a landfill gives off which potent greenhouse gas?

Methane makes up 40 to 60 percent of landfill gas, and US landfills are the third-largest emitter of it; it has 27 times CO2's warming power over a century.

Benjamin Law's 1813 process for turning rags into recycled wool is known by what name?

Shoddy: Benjamin Law of Batley, West Yorkshire, began grinding woollen rags into re-spinnable fibre in 1813, and the word survives as an insult for anything cheaply made.

In Cradle-to-Cradle design, what are materials that can safely return to the soil called?

Biological nutrients: materials such as untreated cotton or wood that can safely decompose back into the soil, as opposed to technical nutrients like metals and polymers, meant to circulate in closed industrial loops.

The three chasing arrows of the recycling symbol are folded into which mathematical shape?

A Möbius strip: each arrow is drawn as a folded band, so the three together trace a one-sided loop with a single edge, echoing an endless cycle of reuse.

Which paperboard maker sponsored the 1970 contest that produced the recycling symbol?

Container Corporation of America, a Chicago paperboard maker, sponsored the contest to promote its recycled-content packaging; it drew more than 500 entries, and the company dropped its trademark application after a challenge.

Which US senator proposed the 1970 teach-in that became the first Earth Day?

Nelson hired young activist Denis Hayes to coordinate the 22 April 1970 event, and the United Auto Workers were its biggest outside backer.

Which US state passed the country's first 'bottle bill' in 1971?

Oregon's 1971 Bottle Bill, the first in the United States, took effect in 1972 with a 5-cent deposit; the refund rose to 10 cents in 2017, and unclaimed deposits stay with the industry cooperative.

In Seinfeld's 'The Bottle Deposit', Kramer and Newman haul empties to which state?

Michigan, whose 10-cent deposit is double New York's 5 cents; Newman's scheme uses a Mother's Day mail truck bound for Saginaw, Michigan, dodging the rental fees that doomed Kramer's earlier attempts.

Which province set up Canada's first mandatory deposit-return system in 1970?

British Columbia's 1970 Litter Act created the first mandatory deposit-return system in North America, initially covering soft-drink and beer containers.

Which Australian state introduced the country's first container deposit scheme in 1977?

South Australia began its container deposit scheme in 1977 with a 5-cent refund, raised to 10 cents in 2008, decades before any other Australian state or territory followed.

Infinitum runs the national deposit scheme for beverage containers in which country?

Norway: Infinitum, founded as Norsk Resirk in 1999 and renamed in 2014, is the industry-owned non-profit behind the 'pant' deposit, with return rates above 90% for cans and PET bottles.

Which company is the world's biggest manufacturer of reverse vending machines?

Its R1 machine lets shoppers tip in more than a hundred containers at once, and has hit 98% return rates in Germany.

The Green Dot packaging symbol was conceived by the environment minister of which country?

Germany: environment minister Klaus Töpfer's 1991 packaging ordinance made producers pay into a 'dual system' of yellow bags and bins, run alongside ordinary municipal collection and signalled by the Green Dot.

Whose 'National Sword' policy banned imports of 24 categories of waste from 2018?

China's National Sword, effective January 2018, banned 24 categories of imported waste and cut allowed contamination to 0.5%, so Western recyclables piled up before being rerouted to Southeast Asia.

The Basel Convention of 1989 restricts cross-border shipments of what?

Hazardous waste: the Basel Convention controls transboundary movements of hazardous wastes and their disposal; radioactive material is deliberately left out and handled through the International Atomic Energy Agency instead.

Which country signed the 1989 Basel Convention but has never ratified it?

Haiti is the only other signatory in the same position; 191 parties had ratified as of June 2024.

In 1988 the Khian Sea dumped 4,000 tons of Philadelphia ash on a beach in which country?

Haiti: the Khian Sea unloaded about 4,000 tons of incinerator ash at Gonaïves in January 1988, passed off as 'topsoil fertilizer'; the remaining 10,000 tons were later admitted to have been dumped at sea.

The 1987 'garbage barge' Mobro 4000 got as far south as which country before turning back?

Belize was the barge's southernmost stop: after six states and three nations (Mexico, Belize and the Bahamas) refused the load, it was burned in Brooklyn and the ash buried back in Islip, New York.

Fresh Kills, once the world's largest rubbish dump, sat in which New York City borough?

Staten Island: Fresh Kills opened in 1948 as a three-year stopgap, took the city's rubbish until 2001, and its mounds were capped for conversion into Freshkills Park, almost three times the size of Central Park.

The 'zero waste' town of Kamikatsu sorts household rubbish into how many categories?

45 categories: Kamikatsu residents wash and sort everything themselves at a single collection centre, after the town of about 1,500 people chose sorting over paying for a new incinerator in 2003.

The Freecycle Network began in 2003 in which US city?

Tucson, Arizona: founder Deron Beal started it in May 2003 with a downtown recycling nonprofit called RISE, and the network later lost its trademark on the word 'freecycle' through naked licensing.

TerraCycle's original product was fertilizer made with the help of which creatures?

Worms: TerraCycle began in 2001 selling liquid worm-casting fertiliser, a 'compost tea', packaged in used soda bottles only because founder Tom Szaky's young company couldn't afford new ones.

Who founded The Ocean Cleanup in 2013?

Boyan Slat, a Dutch inventor then aged 18, pitched passive ocean cleaning in a 2012 TEDx talk, and crowdfunding paid for the foundation's first engineering studies.

Who reported the Great Pacific Garbage Patch after sailing home from a 1997 yacht race?

Charles Moore, sailing home through the North Pacific Gyre after the 1997 Transpac race, hit a stretch of floating debris; his friend, oceanographer Curtis Ebbesmeyer, dubbed it the 'Eastern Garbage Patch'.

Alang, home to the world's largest ship-breaking beach, is in which Indian state?

Gujarat: Alang's beach on the Gulf of Khambhat took its first ship for breaking in 1983 and has handled roughly a third of the world's ship demolition, more than any other single yard.

Agbogbloshie, the notorious 'digital dumping ground', is in which African capital?

Accra: the Agbogbloshie scrapyard in Ghana's capital, nicknamed 'Sodom and Gomorrah', was where workers burned cables to recover copper until authorities bulldozed the site in 2021.

Cairo's Zabbaleen waste collectors feed their organic scraps to which animals?

The community recycles up to 80% of what it collects, far above the 20-25% managed by most Western waste firms.

The UK's first waste incinerators, built in 1874 in Nottingham, were known as what?

Destructors: Manlove, Alliott & Co. built the first in Nottingham in 1874, burning refuse to shrink its bulk; the first US incinerator followed in 1885 on Governors Island, New York.

In 1884, Eugène Poubelle made residents of which city sort waste into three containers?

Paris: as prefect of the Seine, Poubelle ordered Parisian landlords in 1884 to provide three containers (food waste; paper and cloth; glass and crockery), and his surname became the French word for a rubbish bin.

The first blue box recycling trial in 1981 covered 1,500 homes in which Ontario city?

Kitchener: Laidlaw's Nyle Ludolph ran the 1981 pilot in 1,500 homes and won the citywide contract after it, and the blue box went on to be copied by hundreds of cities.

Which New Jersey city became the first in the US to mandate recycling, in 1980?

Woodbury, in Gloucester County, made recycling mandatory in 1980; councilman Donald Sanderson's idea of towing a recycling trailer behind the rubbish truck let both be collected in one pass.

The UK's first bottle bank opened on 6 June 1977 in which Yorkshire town?

Barnsley: Stanley Race, president of the Glass Manufacturers' Federation, opened the first bottle bank there on 6 June 1977, after trials proved usable glass could be made from over 90% recycled material.

Scrap glass that is crushed and fed back into the furnace is known as what?

Glassmakers distinguish internal cullet from their own rejects and offcuts from the external kind collected from the public.

Which process, first described by Justus Claproth in 1774, removes print from recovered paper?

Deinking: German jurist Justus Claproth described the process in 1774, and because ink is only about 2% of waste paper's weight, nearly all the fibre survives for reuse.

Which family founded America's first paper mill using recycled rags, in 1690?

Rittenhouse: William Rittenhouse built the first paper mill in British North America in 1690 on Wissahickon Creek near Germantown, Philadelphia, pulping recycled rags and linen.

Of all the plastic waste produced up to 2015, roughly what share had been recycled?

9%: a 2017 study of the 6.3 billion tonnes of plastic waste generated up to 2015 found 9% recycled, 12% burned and 79% in landfill or the environment; only about 1% had been recycled more than once.

Which country imposed the world's first total ban on lightweight carrier bags in 2002?

Bangladesh banned thin polythene bags in 2002 after they clogged drains during the 1988 and 1998 floods; Ireland chose a 15-cent levy the same year and cut usage by about 90%.

In the 2010s, Brazil led the world in recycling which item, recovering about 98%?

Drink cans: Brazil recovered about 98% of its aluminium drink cans through the 2010s, tens of billions a year, helped by catadores, informal collectors paid by weight for what they gather.

The Tokyo 2020 Olympic medals were made from metal reclaimed from what?

Donated mobile phones: the Tokyo 2020 Medal Project collected about 6.2 million used phones plus other small electronics through boxes at NTT Docomo shops and public buildings, yielding all the gold, silver and bronze needed.

Battery recycler Redwood Materials was founded in 2017 by a co-founder of which company?

Tesla: co-founder J. B. Straubel served as its chief technology officer until 2019, and set up Redwood Materials in Carson City, Nevada, to recover lithium, nickel and cobalt from old batteries.

Dave Hakkens started the open-source Precious Plastic machine project in which country?

Netherlands: Hakkens launched Precious Plastic in 2013 as his graduation project at the Design Academy Eindhoven, publishing free blueprints for plastic shredders, extruders and injection machines.

Catalytic converters are recycled, and stolen, for which precious elements?

Rhodium handles the reduction reactions, palladium the oxidation, and platinum can do both.

Which sorting machine flings non-ferrous metals like copper off a conveyor of mixed waste?

Eddy current separator: a fast-spinning magnetic rotor induces currents in aluminium and copper that fling them off the belt; it sits after the magnets, since ferrous scrap would heat up and damage it.

PLA, the compostable bioplastic used in 3D printing, is usually made from fermented what?

Plant starch: corn, cassava, sugarcane and sugar beet are fermented into lactic acid, which is polymerised into polylactic acid (PLA); it composts only in hot industrial facilities, not home heaps.

Polar fleece jackets can be spun from which recycled item?

PET bottles: Patagonia and Malden Mills introduced fleece made from recycled soda bottles in 1993; Malden had deliberately never patented its 1979 fabric, which is why so many brands make it cheaply.

What term describes tossing doubtful items into the recycling bin rather than the rubbish?

Wishcycling: optimistic bin-filling with greasy boxes, bags and odd plastics contaminates loads, and a contaminated bale can send a whole batch to landfill.

Which organisation launched the 'Crying Indian' anti-litter TV ad on Earth Day 1971?

Keep America Beautiful, set up in 1953 by the American Can Company and Owens-Illinois, ran the ad; the weeping 'Native American' was Italian-American actor Iron Eyes Cody.

The first Repair Café, where volunteers fix items for free, opened in 2009 in which city?

Amsterdam: Dutch journalist Martine Postma held the first Repair Café on 18 October 2009, and the idea has spread to thousands of volunteer-run cafés worldwide.

The Sulaibiya tyre graveyard, once the world's largest, was in which country?

Kuwait: the Sulaibiya dump near Jahra held tens of millions of tyres; a 2012 blaze there was photographed from orbit, and from 2021 the tyres were trucked to Salmi for recycling.

The DuPont engineer who invented the PET drinks bottle was the brother of which painter?

Andrew Wyeth: his brother Nathaniel patented the PET bottle at DuPont in 1973 and liked to call himself 'the other Wyeth', since father N.C. and brother Andrew were so much more famous.

Food cans were traditionally coated with which metal to stop the contents rusting them?

Tin: a thin electroplated layer of tin kept the steel from rusting, hence 'tin cans'; modern cans are often lined with plastic lacquer instead, and steel cans are among the most recycled packaging.

The UK's first environmental tax, introduced by John Gummer in 1996, was a tax on what?

Landfill: the Landfill Tax took effect in October 1996 at £7 a tonne, making dumping dearer to push waste towards recycling and treatment; the standard rate passed £100 a tonne in 2023.