Everything you ever wanted to know about recycling.
A long-form, citation-backed reference for how recycling really works — from plastic codes and aluminum loops to the circular economy and the myths industry tells you. Written for the curious, built like an encyclopedia.
The eight essential guides
If you read only these eight pieces, you'll understand more about recycling than 99% of people.
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01
How It Works
How Does Recycling Work? The Complete Guide
Introduction In a warehouse the size of four football fields outside Chicago, a steel drum the width of a subway tunnel rotates twelve times a minute, tumbling yesterday's…
16 min read -
02
Materials
Plastic Recycling Codes 1-7: What Each Number Means
Introduction, Why the Triangle With a Number Is Everywhere Flip over almost any plastic object in your kitchen, a yogurt tub, a ketchup bottle, a shampoo pump, and…
16 min read -
03
Foundations
The 3 R’s Explained: Reduce, Reuse, Recycle Hierarchy
TL;DR, If every household on Earth recycled perfectly starting tomorrow, we would still be in ecological freefall. Recycling is the least important of the three R's, not the…
22 min read -
04
Materials
Why Aluminum Is the World’s Most Recycled Material
The statistic that stops you cold: roughly 75% of all the aluminum ever produced since 1886 is still in use today. Not buried. Not burned. Still in circulation,…
19 min read -
05
How It Works
Chemical vs Mechanical Recycling: Which One Wins?
Here is the paradox that defines the most heated fight in the waste industry today. Mechanical recyclers say they are the only proven, low-carbon way to keep plastic…
19 min read -
06
Materials
E-Waste: The Growing Problem of Electronic Recycling
1. Introduction: A 62-Million-Tonne Wake-Up Call In 2022, humanity threw away 62 million tonnes of electronic waste. That is not a typo, and it is not a projection.…
22 min read -
07
Foundations
The Circular Economy: Beyond Recycling
1. Introduction, Recycling Is a Tactic; Circularity Is the Strategy Here is the number that stops most people in their tracks: the global economy is only 7.2% circular.…
20 min read -
08
Myths and Facts
Recycling Myths: 10 Things You Thought Were True
Most of what you know about recycling is wrong, but the truth is more interesting. If you have ever stood in front of a blue bin holding a…
21 min read -
09
Materials
PET Recycling: From Bottle to rPET
Walk down any beverage aisle and pick up a clear water bottle. There is a real chance the plastic in your hand has lived a previous life as…
14 min read -
10
Materials
HDPE Recycling: Grades and the rHDPE Market
HDPE recycling is one of the quiet success stories of the plastics industry, and yet it is poorly understood outside the trade. High-density polyethylene, the milk jug, the…
14 min read -
11
Policy
What Is EPR? Extended Producer Responsibility Explained
Walk down any supermarket aisle and you are looking at thousands of decisions about packaging that someone, somewhere, will eventually have to pay to collect, sort and recycle.…
16 min read -
12
Policy
PPWR: The EU Packaging Rules Explained
If you have spent any time around packaging design, brand procurement, or the recyclate trading desk over the last two years, you will have heard three letters thrown…
15 min read -
13
How It Works
How Plastic Is Sorted: NIR, Density and Optical Sorting
If you want to understand how plastic is sorted, you have to picture the floor of a modern material recovery facility (MRF), where a mixed river of bottles,…
16 min read -
14
Science
Food-Grade Recycled Plastic: EFSA, FDA and Safety
Food-grade recycled plastic is one of the most carefully regulated materials in the packaging world, and for good reason: the polymer that once held a forgotten chemical in…
14 min read -
15
History
The History of Recycling: From 1970 to Today
The history of recycling is older than most people imagine, but the version we live with today (the blue bin at the curb, the three chasing arrows, the…
14 min read -
16
Science
Microplastics and the Science of Plastic Degradation
Spend fifteen years on the quality floor of a recycling operation and you stop thinking of plastic as a single material. You start thinking of it as a…
15 min read
Why this exists
Most of what's written about recycling online is either marketing (“just put it in the bin!”) or despair (“it's all a lie, stop trying”). Neither is true. The reality is that recycling is a complex global industry with real chemistry, real economics, and real limits.
recycling.guru is our attempt to write it down properly — long enough to say something true, short enough to finish over coffee. Every article is cited, updated, and written to last.
Editorial team, 2026