It is tempting to judge a device's environmental cost by its power consumption, because that is the number printed on the label. For most computing equipment that is the smaller half of the story. Manufacturing a laptop consumes far more energy than the laptop will use in its entire working life, so the biggest single thing anyone can do is keep a working device working.
Where the impact comes from
| Stage | What it costs | What reduces it |
|---|---|---|
| Raw materials | Mining copper, gold, cobalt, rare earths; habitat and water damage | Recycled materials; recovering metals from old devices |
| Manufacture | Very high energy and ultra-pure water; hazardous chemicals | Longer product lifetimes; fewer devices made |
| Transport | Shipping and air freight emissions | Fewer shipments; local repair rather than replacement |
| Use | Electricity over 3–6 years | Energy Star equipment, sleep settings, efficient power supplies |
| End of life | Toxic landfill, or export to unsafe informal recycling | Reuse, repair, certified recycling |
Embodied energy
Embodied energy is everything spent before a product reaches you: mining, refining, fabrication, assembly and shipping. For a laptop it is typically several times the electricity it will consume in its life. That single fact reorders the usual advice — replacing a working three-year-old laptop with an efficient new one almost always costs more energy overall than keeping the old one.
What is actually in e-waste
- Lead — in older solder and CRT glass. Damages the nervous system, particularly in children.
- Mercury — in older LCD backlights and some switches. Accumulates in fish and moves up the food chain.
- Cadmium — in some batteries and older components. A known carcinogen that damages kidneys.
- Brominated flame retardants — in plastic casings. Persist in the environment and accumulate in living tissue.
- Valuable metals — gold, silver, copper, palladium. A tonne of circuit boards contains far more gold than a tonne of gold ore, which is why recycling is economically worthwhile as well as environmentally necessary.
Why e-waste must not go in the garbage
In landfill, those metals leach into groundwater. Informal recycling in some countries burns plastic casings to recover copper, releasing dioxins, and dissolves boards in acid over open drains — poisoning workers, often including children, and the watershed. Ontario's regulated collection programs exist to keep material out of both paths.
Regulation and standards
| Standard or programme | What it does |
|---|---|
| RoHS | Restricts lead, mercury, cadmium and certain flame retardants in new electronics |
| WEEE | European rules requiring producers to fund collection and recycling |
| Energy Star | Certifies equipment meeting efficiency thresholds in use and in standby |
| EPEAT | Rates devices on recyclability, materials, packaging and longevity |
| Ontario e-waste programs | Municipal depots and retailer take-back for regulated electronics |
| Right to repair | Emerging legislation requiring parts, tools and manuals be made available |
The hierarchy that actually helps
- Reduce — buy what you need rather than what is newest. The greenest device is the one nobody had to make.
- Reuse — a five-year-old laptop with an SSD and more RAM is a perfectly good machine for a student. Donating it avoids both a disposal and a manufacture.
- Repair — replacing a battery or a screen costs a fraction of the embodied energy of a new device.
- Recycle — through a certified processor, so the materials are actually recovered rather than exported.
- Dispose — landfill, the last resort, and illegal in Ontario for most regulated electronics.
Before you donate or recycle
Deleting a file only removes its directory entry — the data stays until overwritten. Use a full-disk wipe on a hard drive, or the drive's built-in secure erase on an SSD. For anything genuinely sensitive, physically destroying the drive and recycling it separately is the only certain answer.
The data-centre question
Computing's footprint is no longer only the device in front of you. Data centres consume a few percent of global electricity, and both video streaming and large-scale AI training have pushed that upward. The picture is genuinely mixed: a data centre is far more efficient per unit of work than millions of individual servers would be, and many operators buy renewable power — but cooling still consumes enormous quantities of water and electricity, and demand keeps growing faster than efficiency improves.