Carbon Footprint
Definition
A carbon footprint is the total greenhouse gas emissions caused by a product, shipment, company, or supply chain, expressed in tonnes of CO2 equivalent (CO2e) across direct operations and purchased energy, and often the full value chain.
In Practice
Supply chains dominate most companies' footprints: scope 3 emissions — those from suppliers, transportation, product use, and disposal — typically dwarf a firm's own scope 1 and 2 totals, often by a factor of 5 to 10. That puts procurement and logistics at the center of decarbonization work.
Mode choice is a powerful lever: moving a tonne of freight by air emits roughly 20–30 times more CO2e per tonne-km than ocean, and truck several times more than rail. Planners reduce footprint through modal shift, better cube utilization, consolidated shipments, nearshoring, and supplier energy programs — and calculate it using frameworks such as the GHG Protocol and GLEC for freight.
Frequently Asked Questions
What are scope 1, 2, and 3 emissions?
Scope 1 is direct emissions from assets the company owns, like its trucks and boilers. Scope 2 is emissions from purchased electricity and heat. Scope 3 is everything else in the value chain — supplier production, purchased transportation, distribution, product use, and end-of-life — and usually represents the large majority.
How does freight mode choice affect carbon footprint?
Enormously. Per tonne-kilometer, air freight emits roughly 20–30 times more CO2e than ocean shipping, and road freight several times more than rail. Shifting even part of a lane from air to ocean, or road to rail or intermodal, is often the single fastest logistics decarbonization lever available.
How is a product's carbon footprint calculated?
By summing emissions across its life cycle: raw material extraction, component manufacturing, inbound and outbound transportation, assembly energy, packaging, distribution, and often use and disposal. Standards such as the GHG Protocol Product Standard and ISO 14067 define boundaries and emission factors so results are comparable.
Related Calculators
Related Terms
A carbon handprint is the positive climate impact a product or company creates by helping others avoid or reduce emissions — the beneficial mirror image of a carbon footprint, which measures the harm caused.
Sustainable Supply ChainA sustainable supply chain manages environmental and social impacts across sourcing, production, and logistics, covering emissions, waste, water, labor practices, and ethical sourcing alongside cost and service.
Circular Supply ChainA circular supply chain keeps products and materials in use through return, repair, refurbishment, remanufacturing, and recycling, replacing the traditional linear take-make-dispose model.
HazmatHazmat (hazardous materials, also called dangerous goods) refers to substances that pose risks to health, safety, property, or the environment during transport or storage — such as flammables, corrosives, batteries, and compressed gases — and are governed by strict regulations.