# Before the Melt — The Physics and Climate of E-Waste

Over 80% of an IT device's carbon footprint is consumed before the user ever presses the power button. When a computer is fed into a recycling furnace, all of that microscopic order is destroyed simply to recover a few grams of scrap metal.

---

## Key Metrics

- **Climate Efficiency Multiplier:** 10.6×
- **Emissions avoided by refurbishing a desktop PC + Monitor setup:** ~265 kg CO₂e
- **Emissions avoided by conventional recycling (smelting):** ~25 kg CO₂e

---

## 1. The Iceberg Hidden in Silicon

The climate value of an integrated circuit does not lie in the weight of its raw materials, but in the colossal energy invested to arrange billions of transistors at the nanometre scale:

1. **Motherboard, CPU & GPU (42% · 105 kg CO₂e):** Monocrystalline silicon purified at 1,420°C to electronic grade (99.9999999%), extreme ultraviolet (EUV) lithography at 13.5 nm in high vacuum, and thousands of microscopic copper and gold traces.
2. **Display Panel & LED Backlight (28% · 70 kg CO₂e):** Thin-film transistor (TFT) substrate deposited on precision optical glass, multilayer polymer polarising filters, and an indium-gallium LED backlight matrix.
3. **SSD Storage (3D NAND) & RAM (16% · 40 kg CO₂e):** Up to 232 nanometre-scale layers of 3D floating-gate cells fabricated in Class 1 cleanrooms using thousands of litres of ultrapure water per chip.
4. **Power Supply Unit & Capacitors (8% · 20 kg CO₂e):** Sintered ferrite magnetic cores, high-purity aluminium electrolytic capacitors, and power MOSFET transistors mounted on dedicated heat spreaders.
5. **Chassis, Heatsinks & Fans (6% · 15 kg CO₂e):** Galvanised cold-rolled sheet steel, extruded copper and aluminium heat sinks, and high-pressure injection-moulded polymer frames.

---

## 2. The Two Destinies of a Device

- **Smelting (Pyrometallurgy):** The equipment is shredded and melted at temperatures over 1,200°C. Recovers raw secondary metals only (avoids ~25 kg CO₂e per PC).
- **Refurbishment & Reuse:** The equipment is cleaned, tested, and fitted with fresh storage. Lifespan extension defers new manufacturing (avoids ~265 kg CO₂e per PC).

---

## 3. Carbon Density: Why Physical Weight is Deceptive

According to RREUSE / OutOfUse data, energy density is inversely proportional to physical mass:

| Device | Typical Weight | Refurbishment | Recycling | CO₂e Density | Ratio |
| :--- | :--- | :--- | :--- | :--- | :--- |
| **Smartphone** | 0.2 kg | 55 kg CO₂e | 1.9 kg CO₂e | **275.0 kg / kg** | 28.9× |
| **Small Tablet (7–8")** | 0.3 kg | 95 kg CO₂e | 0.4 kg CO₂e | **316.7 kg / kg** | 237.5× |
| **Ultraportable Laptop** | 1.2 kg | 280 kg CO₂e | 6.0 kg CO₂e | **233.3 kg / kg** | 46.7× |
| **Standard Laptop (14–15")** | 1.6 kg | 280 kg CO₂e | 8.0 kg CO₂e | **175.0 kg / kg** | 35.0× |
| **USDT Desktop (Ultra Small)** | 2.4 kg | 290 kg CO₂e | 8.8 kg CO₂e | **120.8 kg / kg** | 33.0× |
| **Monitor < 33"** | 6.6 kg | 440 kg CO₂e | 11.6 kg CO₂e | **66.7 kg / kg** | 37.9× |
| **SFF Desktop** | 6.7 kg | 380 kg CO₂e | 24.7 kg CO₂e | **56.7 kg / kg** | 15.4× |
| **Full Tower Desktop** | 15.0 kg | 750 kg CO₂e | 55.3 kg CO₂e | **50.0 kg / kg** | 13.6× |
| **Large Office Printer** | 26.0 kg | 180 kg CO₂e | 53.0 kg CO₂e | **6.9 kg / kg** | 3.4× |

---

## 4. Material Physics: Pure Gold vs. Copper & Monitor Footprints

- **Pure Gold (ENIG Contacts):** 14,500 kg CO₂e per kilogram (3,450× more carbon intensive than copper).
- **Tantalum & Palladium (MLCC Capacitors):** 8,500 kg CO₂e per kilogram.
- **Monocrystalline Silicon (9N Electronic Grade):** 1,100 kg CO₂e per kilogram.
- **Primary Copper:** 4.2 kg CO₂e per kilogram (vs. 0.85 kg CO₂e for recycled secondary copper).
- **The Monitor Paradox:** Two 24-inch displays weighing an identical 6.6 kg can have completely different footprints: an active matrix IGZO/TFT OLED or IPS panel with ENIG gold contacts concentrates 3× more embodied energy than a legacy CCFL screen with a heavy case.

---

## 5. The Ateliere Fără Frontiere (Educlick) Case Study

- **Computers refurbished and donated to schools:** 40,000 units
- **Total avoided greenhouse gas emissions:** 10,600 tonnes CO₂e
- **Equivalent passenger car travel (at 120 g CO₂/km):** 88,333,333 kilometres (2,204 times around Earth's equator)
- **Annual carbon sequestration of mature trees:** 481,818 trees
- **Citizen annual footprint equivalent:** Equal to the yearly carbon footprint of 1,631 individuals

---

## Methodological References

- **Ateliere Fără Frontiere (Romania):** Operational calculation dataset for the *Educlick* & *reDEEE* circular initiatives.
- **OutOfUse (Belgium) & VITO / Fraunhofer IZM:** *Calculateur CO2 & Méthodologie WEEE (2021–2025)*.
- **AERESS (Spain / RREUSE):** *Calculadora de Reutilización*.
- **ADEME (France):** *Environmental impact assessment of refurbished equipment* (2022–2024) & *Base Empreinte*.

---

*Published by Marius Comper at `https://mariuscomper.uk/inainte-de-topire/en/`.*