Which of the following describes a primary carbon footprint?

• A. Measures direct emissions of CO2 from burning of fossil fuels, including transport and domestic energy consumption
• B. Measures indirect CO2 from the products we use
• C. Measures emissions from land use
• D. Measures emissions from agriculture

Answer: (A)

A primary carbon footprint is about direct CO2 emissions from burning fossil fuels in activities you control. When you drive your car or heat your home with gas, the CO2 is released right at the source—the fuel is burned and the emissions occur where you use the energy. That direct, on-site emission is what the primary footprint measures. The other descriptions refer to emissions that aren’t produced directly by those immediate actions—like CO2 tied up in products you buy or emissions from processes like land use or farming—so they fall into other types of footprint accounting.