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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.
Pegadas de carbono pessoais, com as barras de erro mostradas
A maioria dos conselhos sobre carbono para consumidores classifica as ações pela virtude que parecem ter. A avaliação do ciclo de vida classifica-as pelo tamanho, e as duas ordenações mal se sobrepõem.
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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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