Mumbai’s slumdog recycling works surprisingly well – unless you’re one of its workers

Flying over Dharavi, a vast and sprawling slum in Mumbai with a knack for recycling. Image: Mike Towber

Dharavi is a 550-acre slum, a maze of corrugated iron and open sewers at the heart of India’s financial capital, Mumbai.

It is one of the most densely populated places on earth with population of roughly one million people.

A casual observer would see nothing but poverty, misery and squalor but look closer and you’ll find that the slum is the unlikely home of a recycling industry with efficiency levels reportedly higher than the UK’s.

For those struggling to survive, there is value in almost anything and nothing goes to waste. Prince Charles once even said that the slum, made famous by the film Slumdog Millionaire, was a model for the world in terms of sustainability.

Over the decades, Bollywood has sold an image of Mumbai as the ‘City of Dreams’, and people from all corners of the subcontinent have travelled to the city in search of a better life. The large majority of them end up in slums, like Dharavi.

This huge rural to urban migration has catapulted Mumbai, once a small British trading port, into the global league of megacity, with an eyewatering population of 21m (Greater Manchester’s population is 2.8m).

Mumbai's vast population of 21m creates problems. Image: Skye Vidur.

The problems that come with such a population are immense. Simply delivering electricity, sanitary provisions and clean water to the population is a mammoth task. But there’s one problem that stands out everywhere in India – rubbish.

In India, the handling of waste is considered a huge social taboo.

Historically, the lowest ranks of the Hindu caste system have been left to deal with waste disposal and many will still consider a person low and dirty if they handle more than the bare minimum of waste. Consequently, waste is dumped everywhere -- in the streets, in the sea or behind homes.

Mumbai is no stranger to the problem. Every day the city will produce a veritable mountain of over 10,000 metric tonnes of solid waste.   

This will be collected in large part by an army of 120,000 rag-pickers – unofficial waste collectors – who will take anything reusable they find to Dharavi and its famed 13th compound.

Plastic piles up for recycling in Dharavi. Image: Cory Doctorow

They will sell their waste by the kilo to the hundreds of small recycling plants, and a kilogram of plastic bottles might be worth 15p. 

The waste will then be processed by thousands of workers employed by the scrap masters. Dozens of plastic variations will be skilfully sorted into piles. These piles will be melted down in huge vats before being broken up into tiny reusable pellets. Metals and E-Waste will be broken down and sold for scrap or reusable parts.

In this way, it’s estimated that 80 per cent of the Mumbai’s solid waste is recycled into usable materials. The UK’s recycling rate was almost half that, with just under 45 per cent of household waste recycled in 2015.

Politicians are well aware that the slum’s work is essential. Situated in the centre of Mumbai, Dharavi sprawls across some of the most desirable real-estate in Asia.

Dharavi's bustling messiness. Image: Institute for Money, Technology, and Financial Inclusion

However, the government knows that if they start to redevelop the land and damage the industry, the city will soon be drowning in its own waste.


The whole of Mumbai would simply be “one dump yard” if it weren’t for the ragpickers and the recycling units in the slums, says Vinod Shetty from the Acord Foundation, an NGO working in Dharavi.

Dharavi has a huge internal economy, which is estimated to be worth around £700m. Along with leatherworking, recycling forms a fundamental part of the economy. A fifth of the slum’s population are estimated to be employed in waste disposal.  

However, while the work is effective, it’s incredibly hazardous, with few units adhering to any form of regulation. Workers will sift through piles of festering rubbish with no safety equipment in extreme heat, with many children, age as young as five, working alongside the adults for as little as £1 a day.

Residents along Dharavi's narrow streets and alleyways. Image: Kounosu

Small cuts and wounds quickly become infected as workers sift through medical waste and other biohazardous substances.

Rag-pickers and recyclers hail mainly from the lower rungs of India’s caste system and struggle to gain formal recognition from the authorities.

“Most of the waste pickers in Mumbai are either women or children and they live and work under the most distressing conditions,” says Vimlendu Jha, director of environmental NGO Swechha.

“[They’ll be] harassed by the police for not having a proof of identity. Their contribution is never acknowledged.

“There is no clear policy to protect their rights or provide better conditions. The government doesn’t even acknowledge they exist.”

All this will need to change – or it won’t just be the rubbish that’s revolting.

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The IPPC report on the melting ice caps makes for terrifying reading

A Greeland iceberg, 2007. Image: Getty.

Earlier this year, the Intergovernmental Panel on Climate Change (IPCC) – the UN body responsible for communicating the science of climate breakdown – released its long-awaited Special Report on the Ocean and Cryosphere in a Changing Climate.

Based on almost 7,000 peer-reviewed research articles, the report is a cutting-edge crash course in how human-caused climate breakdown is changing our ice and oceans and what it means for humanity and the living planet. In a nutshell, the news isn’t good.

Cryosphere in decline

Most of us rarely come into contact with the cryosphere, but it is a critical part of our climate system. The term refers to the frozen parts of our planet – the great ice sheets of Greenland and Antarctica, the icebergs that break off and drift in the oceans, the glaciers on our high mountain ranges, our winter snow, the ice on lakes and the polar oceans, and the frozen ground in much of the Arctic landscape called permafrost.

The cryosphere is shrinking. Snow cover is reducing, glaciers and ice sheets are melting and permafrost is thawing. We’ve known this for most of my 25-year career, but the report highlights that melting is accelerating, with potentially disastrous consequences for humanity and marine and high mountain ecosystems.

At the moment, we’re on track to lose more than half of all the permafrost by the end of the century. Thousands of roads and buildings sit on this frozen soil – and their foundations are slowly transitioning to mud. Permafrost also stores almost twice the amount of carbon as is present in the atmosphere. While increased plant growth may be able to offset some of the release of carbon from newly thawed soils, much will be released to the atmosphere, significantly accelerating the pace of global heating.

Sea ice is declining rapidly, and an ice-free Arctic ocean will become a regular summer occurrence as things stand. Indigenous peoples who live in the Arctic are already having to change how they hunt and travel, and some coastal communities are already planning for relocation. Populations of seals, walruses, polar bears, whales and other mammals and sea birds who depend on the ice may crash if sea ice is regularly absent. And as water in its bright-white solid form is much more effective at reflecting heat from the sun, its rapid loss is also accelerating global heating.

Glaciers are also melting. If emissions continue on their current trajectory, smaller glaciers will shrink by more than 80 per cent by the end of the century. This retreat will place increasing strain on the hundreds of millions of people globally who rely on glaciers for water, agriculture, and power. Dangerous landslides, avalanches, rockfalls and floods will become increasingly normal in mountain areas.


Rising oceans, rising problems

All this melting ice means that sea levels are rising. While seas rose globally by around 15cm during the 20th century, they’re now rising more than twice as fast –- and this rate is accelerating.

Thanks to research from myself and others, we now better understand how Antarctica and Greenland’s ice sheets interact with the oceans. As a result, the latest report has upgraded its long-term estimates for how much sea level is expected to rise. Uncertainties still remain, but we’re headed for a rise of between 60 and 110cm by 2100.

Of course, sea level isn’t static. Intense rainfall and cyclones – themselves exacerbated by climate breakdown – can cause water to surge metres above the normal level. The IPCC’s report is very clear: these extreme storm surges we used to expect once per century will now be expected every year by mid-century. In addition to rapidly curbing emissions, we must invest millions to protect at-risk coastal and low-lying areas from flooding and loss of life.

Ocean ecosystems

Up to now, the ocean has taken up more than 90 per cent of the excess heat in the global climate system. Warming to date has already reduced the mixing between water layers and, as a consequence, has reduced the supply of oxygen and nutrients for marine life. By 2100 the ocean will take up five to seven times more heat than it has done in the past 50 years if we don’t change our emissions trajectory. Marine heatwaves are also projected to be more intense, last longer and occur 50 times more often. To top it off, the ocean is becoming more acidic as it continues to absorb a proportion of the carbon dioxide we emit.

Collectively, these pressures place marine life across the globe under unprecedented threat. Some species may move to new waters, but others less able to adapt will decline or even die out. This could cause major problems for communities that depend on local seafood. As it stands, coral reefs – beautiful ecosystems that support thousands of species – will be nearly totally wiped out by the end of the century.

Between the lines

While the document makes some striking statements, it is actually relatively conservative with its conclusions – perhaps because it had to be approved by the 195 nations that ratify the IPCC’s reports. Right now, I would expect that sea level rise and ice melt will occur faster than the report predicts. Ten years ago, I might have said the opposite. But the latest science is painting an increasingly grave picture for the future of our oceans and cryosphere – particularly if we carry on with “business as usual”.

The difference between 1.5°C and 2°C of heating is especially important for the icy poles, which warm much faster than the global average. At 1.5°C of warming, the probability of an ice-free September in the Arctic ocean is one in 100. But at 2°C, we’d expect to see this happening about one-third of the time. Rising sea levels, ocean warming and acidification, melting glaciers, and permafrost also will also happen faster – and with it, the risks to humanity and the living planet increase. It’s up to us and the leaders we choose to stem the rising tide of climate and ecological breakdown.

Mark Brandon, Professor of Polar Oceanography, The Open University.

This article is republished from The Conversation under a Creative Commons license. Read the original article.