Carbon Footprint

Summary: The total amount of CO₂ and other greenhouse gases emitted over the full life cycle of a product, service, or event. Tags: igcse chemistry definition environmental-chem Created: 2026-07-14 Last Updated: 2026-07-14

A carbon footprint is the total mass of carbon dioxide and other greenhouse gases, expressed in kilograms or tonnes of CO₂ equivalent (CO₂e), that are emitted throughout the entire life cycle of a product, service, event, or individual’s activities. The full life cycle assessment encompasses every stage: extraction and processing of raw materials, manufacturing and production, packaging, transportation and distribution, consumer use, and finally disposal, landfill, or recycling at end-of-life. Carbon footprints are calculated not just for carbon dioxide but also for other greenhouse gases such as methane (CH₄) and nitrous oxide (N₂O), which are converted into CO₂ equivalents based on their global warming potential to allow meaningful comparison. Practical strategies to reduce a carbon footprint include switching energy generation from fossil fuels to renewables (solar, wind, hydroelectric), improving energy efficiency in buildings and industrial processes, reducing consumption and reusing products, recycling materials to avoid new production, and increasing reforestation to absorb atmospheric CO₂ through photosynthesis. In the IGCSE exam, students are often asked to apply the concept by suggesting and explaining specific, practical methods to reduce the carbon footprint of a given product or industrial process, linking each suggestion to a particular stage of the life cycle.

Key term — IGCSE Chemistry (0620/0971) glossary.