FunRecycle calculates environmental impact using standardized per-kilogram coefficients derived from internationally recognized environmental research. This article explains the formulas, assumptions, and scientific basis behind the numbers shown in the app.
Our goal is transparency, methodological consistency, and scientific credibility.
1️⃣ Core Calculation Formula
All impact values use linear scaling:
CO₂ Avoided
CO₂ Avoided (kg) =
Weight recycled (kg) × CO₂ coefficient (kg CO₂ per kg material)
Water Saved
Water Saved (L) =
Weight recycled (kg) × Water coefficient (L per kg material)
Landfill Volume Avoided (Loose Volume)
Landfill Avoided (L) =
Weight recycled (kg) × Loose volume coefficient (L per kg material)
We use loose waste volume rather than compacted landfill volume because compacted values (~1 L/kg for most materials) would not differentiate between waste types.
2️⃣ Current Model Coefficients (FunRecycle v1.0)
| Material | CO₂ Avoided (kg/kg) | Water Saved (L/kg) | Landfill Avoided (L/kg, loose) |
|---|---|---|---|
| PET | 1.27 | 10 | 66 |
| Paper | 3.91 | 30 | 5.22 |
| Glass | 0.31 | 3 | 4.44 |
| Organic (Compost) | 0.20 | 2 | 3.64 |
These values are harmonized mid-range coefficients derived from multiple public environmental datasets.
3️⃣ Scientific Sources Behind the Model
The coefficients are informed by internationally recognized environmental research and Life Cycle Assessment (LCA) databases.
- US EPA – WARM Model
- IPCC – Methane & Climate Factors
- European Environment Agency (EEA)
- Ecoinvent / GaBi LCA databases
5️⃣ Important Modeling Assumptions
• Linear scaling per kg
• Average global energy mix
• Successful recycling outcome
• Standardized waste density
• Composting avoids anaerobic methane generation
Values represent system-level average environmental effects.