A carbon footprint is the total quantity of greenhouse gases, expressed as carbon dioxide equivalent (CO2e), emitted directly and indirectly by an individual, organisation, product, or activity over a defined period. It aggregates scope 1, 2, and 3 emissions to provide a single comparable measure of climate impact. Carbon footprints matter because they are the baseline metric for emissions reduction targets, disclosure, and offsetting strategies.
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- Footprint accounting follows protocols such as the GHG Protocol, partitioning emissions into operational (scope 1), purchased-energy (scope 2), and value-chain (scope 3) categories. Energy-intensive systems like proof-of-work mining are scrutinised through footprint analysis that weighs electricity sources and grid carbon intensity.