Sydney's landfills are on track to run out of space by 2030, which is a genuinely wild deadline once you learn what actually goes into building one. Clean Up Australia has just published a proper breakdown of how landfills are engineered, and it turns out a hole in the ground does not even come close.
What Actually Goes Into a Landfill
A modern landfill needs a liner system, usually a tough synthetic plastic layer combined with compacted clay, just to stop leachate (the liquid that seeps through rotting rubbish) from reaching groundwater. On top of that, sites need active leachate collection and treatment, plus a network of wells and pipes to capture landfill gas, mostly methane and carbon dioxide, before it escapes into the atmosphere. It is basically a small chemical plant, dressed up as a hole in the ground.
The Numbers Are Bigger Than the Bridge Comparisons
Globally, we generate about 2 billion tonnes of municipal solid waste a year, and roughly 1.4 billion tonnes of that, around 70 per cent, ends up in landfill or an open dump. Closer to home, Australians send about 5 million tonnes of food waste to landfill every year, on its own. NSW's new organic waste reforms are expected to divert up to 950,000 tonnes of that away from landfill, which is the kind of number that actually makes a dent.
The Real Fix Isn't Building More Landfills
Clean Up Australia points to Wales as the benchmark: a national strategy aiming for a zero-waste society by 2050, built on cutting single-use items, eliminating avoidable food waste and chasing the world's highest recycling rate. The throughline is the same one turning up in report after report: the cheapest landfill is the one you never needed to build.
Read the full explainer from Clean Up Australia, 23 September 2026.
Related reading: Why We Chose Home-Compostable Over Recyclable Packaging and What Happens to Your Empty Bathroom Plastic?.
A liner, a leachate system and a network of gas wells, all just so a wrapper can sit underground doing nothing for a few hundred years. Ours is out here doing its best impression of a banana peel: a few months, into the compost, back into the garden. Genuinely satisfying to watch. Not sure why that isn't a bigger spectator sport.