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Ranking
Which changes are actually large?
Household footprint accounting puts heating, transport and diet far ahead of everything people usually think about.
Personliga koldioxidavtryck, med de angivna felmarginalerna
De flesta konsumentråd om koldioxid rangordnar åtgärder efter hur dygdiga de känns. Livscykelanalys rangordnar dem efter storlek, och de två rangordningarna överlappar knappt.
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The ordering problem
Recycling, turning off lights and avoiding plastic bags dominate the public conversation and are among the smallest levers available. Heating, flying, driving and diet dominate an actual household footprint. The gap between what people do and what matters is the single most useful thing this site can point at.
Food
The food footprint
Dietary shift has real, measurable effects — and the variation within a food category can exceed the variation between categories.
Aviation
Flying and non-CO₂ effects
Contrails and other non-CO₂ effects roughly double aviation's warming impact, and most calculators ignore them.
Tools
Do carbon calculators work?
They have been evaluated. Their value is educational rather than accounting — the uncertainty is very large.
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