A carbon footprint is the total amount of greenhouse gases (GHGs) — primarily carbon dioxide (CO₂) but also methane (CH₄), nitrous oxide (N₂O), and others — emitted directly or indirectly by a person, organization, product, or activity. These emissions are always expressed as “CO₂ equivalent” (CO₂‑e) , meaning all greenhouse gases are converted into an equivalent amount of CO₂ based on their global warming potential (GWP). 💡 Types of Carbon Footprints Category Definitio