Waste

Waste

Anaerobic digesters

Food waste & methane

Problem

Landfilled food waste releases methane, a potent greenhouse gas.

Fix

Anaerobic digesters turn waste into biogas and soil fertilizer.

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Waste

Bottle-to-bottle recycling

Single-use plastic drink bottles

Problem

Clear plastic drink bottles are designed for a short life. Most still become landfill, incinerator fuel, or downcycled fiber after one use.

Fix

Mechanical recycling with deposit return and super-clean washing already turns bottles back into food-grade bottles in the European Union and other deposit regions. Collection and sorting decide the result more than the extruder. Colored and mixed plastics still drop out. The number of new bottles on shop shelves still sets how much material comes back.

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Waste

Municipal organics composting

Food and garden waste in landfills

Problem

When cities bury food scraps and yard waste, they throw away soil carbon and make landfill methane. Organics are often the heaviest part of household bins.

Fix

Separate collection plus open turned piles or enclosed composting vessels is routine in cities such as San Francisco, Milan, and much of South Korea and the European Union. Compost goes to farms and parks. Plastic and glass in the bins still spoil piles. Households that throw away less food send a smaller load to those piles.

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Waste

Landfill gas to energy

Landfill methane

Problem

Old dumps keep making methane for decades after they close. The gas is a strong greenhouse pollutant and a local explosion and odor hazard.

Fix

Wells and pipes pull landfill gas to a flare or an engine. Sites on the United States Environmental Protection Agency landfill-methane list, in the United Kingdom, and elsewhere already generate electricity this way. Capture is partial and leaks remain. Waste keeps arriving while the wells run. Farm and food digesters are a separate practice that treats fresh organic waste.

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Waste

Sorting with optics and cameras

Mixed recyclables that nobody can sell

Problem

Household recycling arrives as a mixed stream. If paper, film, and food stay in the pile, bales are dirty and mills reject them. Manual picking cannot keep up with belt speed.

Fix

Material recovery facilities use screens, magnets, separators that fling aluminium cans off the belt, and optical sorters that read near-infrared light, increasingly with cameras and software, to separate containers and paper fiber. The United States Environmental Protection Agency recycling page is the public face of that system in the United States. How well a city collects, and which plastics a mill will buy, still set what the machines can separate.

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Waste

Textile-to-textile recycling

Clothes that become rags or trash

Problem

Most discarded clothing is reused as second-hand stock, downcycled into rags and insulation, incinerated, or landfilled. New garments still start from virgin fiber.

Fix

The European Union strategy for sustainable and circular textiles aims at design, collection, and recycling so that more fiber can become new textiles. The European Commission notes that almost none of the material in clothing is recycled into new clothing today. Plants that turn old fiber into new textile fiber exist as early industry. A street collection bin gathers clothes. A closed loop also needs a plant that can make new cloth from them.

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Waste

Construction and demolition recycling

Buildings demolished into mixed rubble

Problem

Concrete, brick, wood, metal, and glass from sites are often the heaviest waste a country moves. Mixed with paint, insulation, or asbestos, the pile is hard to reuse.

Fix

The European Commission treats construction and demolition waste as a priority stream and says it accounts for more than a third of European Union waste. Crushing clean concrete and brick into aggregate, pulling metals, and sorting wood are ordinary where demolition is selective. Recovery rates vary widely between member states. Faster demolition still fills the crushers with more mixed rubble.

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Waste

Black soldier fly processing

Market waste that rots in the open

Problem

City markets throw fruit and vegetable waste into heaps that smell, attract vermin, and go to dumps. Farms nearby still buy imported feed and fertilizer.

Fix

Larvae of the black soldier fly (Hermetia illucens) eat wet organic waste. Dried larvae can be used as animal or fish feed, and the leftover residue can go on soil. The Food and Agriculture Organization describes a project in Abidjan, Côte d’Ivoire, that breeds the flies and trains farmers to use the products. It is a working method, still local and labor-intensive. Someone still has to collect the scraps and bring them to the trays. Plastic and metals need a different line.

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Waste

Waste-to-energy

Residual waste that still has heat in it

Problem

After recycling and organics are pulled out, cities still have a residual stream. Landfill takes the volume and keeps making methane. Open burning is worse.

Fix

Municipal plants that recover energy from waste burn the residual stream and raise steam for electricity or heat. The United States Environmental Protection Agency note on energy recovery from waste describes direct burning of mixed residual waste as the common United States design, with ash sent to landfill and air controls required under later rules. Plants need a steady residual stream. Recycling and organics sorting still happen before that stream is burned. Emissions and ash remain. Making less waste shrinks what the furnace receives.

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Waste

The Ocean Cleanup

Legacy plastic already in the ocean

Problem

Plastic that has already reached subtropical gyres is a problem of the open ocean. It fragments into smaller pieces that are harder to collect and easier for wildlife to ingest.

Fix

The Ocean Cleanup, a Dutch non-profit, tows floating systems in the Great Pacific Garbage Patch and also runs river interceptors. The organization publishes its own removal totals and a 2040 target. Those figures come from the organization. Cleanup at sea is slow, weather-limited, and debated because the gear can catch marine life along with plastic, and because of its scale. Cutting leakage on land keeps new plastic from reaching the gyres.

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Waste

Interceptor

River plastic on the way to the sea

Problem

Most ocean plastic that can still be caught as recognizable litter arrives through rivers after rain. Once it is offshore, collection is harder and more expensive.

Fix

The Ocean Cleanup interceptor is a family of river systems (Original, Barrier, Tender, Barricade, and Guard) that use booms and, in the Original, solar-powered extraction to lift debris before it reaches the sea. Deployments are site-specific, and each river needs its own fit. The machine catches litter at the mouth. Collection further upstream, and making less plastic, shrink what arrives there.

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Waste

Deposit-return systems

Problem

Empty drinks packaging lost to litter and mixed bins

Fix

A small deposit on a bottle or can is refunded when the empty container comes back to a collection point. Some schemes collect more than 90 percent of the containers they cover, and litter surveys record fewer of those containers on the ground.

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Waste

Extended producer responsibility for packaging

Problem

Packaging waste keeps growing while municipalities carry the cost of collecting it

Fix

Extended producer responsibility makes the companies that put packaging on the market responsible for it after use, by paying for collection and recycling or by organising them. In the European Union, packaging waste reached 186.5 kg per person in 2022.

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Waste

E-waste collection and recycling

Problem

Discarded electronics pile up faster than formal recycling grows

Fix

Documented collection and recycling of discarded electronics recovers copper, gold and other metals. In 2022 the world generated 62 billion kg of e-waste, and 22.3 percent of it was documented as formally collected and recycled.

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Waste

Lithium-ion battery recycling

Problem

Critical minerals sit in batteries that will reach recyclers in volume only from about 2035

Fix

Recycling lithium-ion batteries recovers lithium, nickel, cobalt and copper, first from manufacturing scrap and later from packs that leave vehicles and storage systems. The International Energy Agency finds that recycling capacity today exceeds the feedstock available.

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Waste

Food-waste reduction

Problem

Edible food is thrown away in shops, kitchens and homes

Fix

Cutting food waste keeps meals in the human food chain and saves the farm resources already spent on them. In 2022 the world wasted 1.05 billion tonnes of food, which is 19 percent of the food available to consumers.

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