A cardboard box: carbon footprint

A cardboard box comes in at about 0.29 kg CO₂e / kg (landfilling 1 kg).

Of the 8 things you throw away Carbonle tracks, A cardboard box sits at #5 from the lightest — mid-pack.

Cardboard breaks down in a landfill and releases methane as it goes.

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Figures from EPA WARM v15 (2019), landfilling pathway; public domain, licensed public domain.
How we get these numbers: Methodology.