How It Works: Tracking Environmental Impact from Cradle to Grave

⚙️ How It Works: Tracking Environmental Impact from Cradle to Grave

A Life Cycle Assessment (LCA) works by systematically mapping every stage of a product's existence and calculating the environmental burden at each step. Analysts identify all the inputs (raw materials, energy, water) and outputs (products, emissions, waste) at every stage.

The four stages form a chain: Raw Material Extraction → Manufacturing → Use Phase → End of Life. An LCA analyst assigns a numerical impact to each stage — for example, kg of CO₂ emitted, litres of water consumed, or area of habitat destroyed. These figures are then added across all stages to give a total "environmental footprint."

For example, a smartphone LCA reveals that mining rare earth metals (Stage 1) accounts for roughly 85% of the phone's entire environmental impact — more than manufacturing, the entire use phase, and disposal combined. Without an LCA, a consumer might assume most impact comes from charging the phone daily, which is in fact a minor contributor.

LCA is described as a "cradle to grave" approach because it starts at the very beginning (the "cradle" — extraction of raw materials from the earth) and ends at final disposal (the "grave" — landfill, incineration, or recycling). A "cradle to cradle" approach extends this further, where the end of one product's life becomes the raw material for another product, creating a closed loop.