Carbon accounting
Carbon accounting is a way to measure and track how much greenhouse gas (GHG) an organization, a product, or a place emits. It helps people see where emissions come from, set targets to reduce them, and monitor progress over time. Governments, cities, companies, and other groups use these methods to manage climate risk and meet sustainability goals.
Emissions are grouped into three categories called scopes. Scope 1 covers direct emissions from activities you own or control, like burning fuel on site or company vehicles. Scope 2 covers indirect emissions from the energy you buy, such as electricity. Scope 3 includes all other indirect emissions in your value chain, such as suppliers, product use, and waste. Scope 3 often accounts for the largest share of total emissions and is the hardest to measure.
A typical process starts with defining a boundary, gathering data, calculating emissions, and reporting the results clearly. This allows for consistent comparisons over time and between organizations. People pursue GHG accounting to fulfill social responsibilities, meet laws or regulations, report to investors, manage climate-related financial risks, and sometimes save money through efficiency improvements.
Several standards guide how to do this. The Greenhouse Gas Protocol is the most widely used set of rules, with guidance for corporate accounting and for product life cycles. ISO 14064 provides verification and additional structure, and there are other standards for products, services, and cities. Organizations can use different approaches, such as attributional accounting (assigning emissions to a company or product) or consequential accounting (looking at the effect of a decision or project).
GHG accounting supports many activities. Companies report their emissions to investors and customers, while cities and nations use inventories to track progress toward climate goals. Life cycle assessment helps quantify a product’s climate impact from beginning to end, which can reveal opportunities to reduce emissions in the supply chain or during use.
There are many programs and groups involved. The CDP (formerly the Carbon Disclosure Project) collects emissions data from thousands of companies and cities. The Science Based Targets initiative (SBTi) helps organizations set targets aligned with scientific climate goals. The Task Force on Climate-Related Financial Disclosures (TCFD) provides guidance on what information to disclose to investors. In regulation, the EU’s Corporate Sustainability Reporting Directive and the U.S. Securities and Exchange Commission proposals push for broader climate-related disclosures. National programs like the U.S. Greenhouse Gas Reporting Program require reporting by large facilities and key suppliers. Markets for carbon credits and offsets rely on credible accounting to ensure that claimed reductions are real, permanent, and additional.
Standards also cover how to report product emissions. Product-level standards (like GHG Protocol Product Standard and ISO 14067) require calculating emissions across a product’s life cycle, from raw materials to disposal. This helps companies understand a product’s total climate impact and identify where to cut emissions most effectively. Offsets and certification schemes (such as Verra’s Verified Carbon Standard, the Gold Standard, and others) are used to compensate for remaining emissions, but they must meet strict rules to avoid problems like double counting, non-permanence, and lack of additionality (whether the project would have happened anyway).
Two important challenges come up often. Scope 3 emissions can be very hard to estimate because they depend on many outside factors and suppliers. Data quality and consistency can vary, making comparability difficult. Double counting—claiming the same emission reductions more than once—hurts credibility and can raise costs for everyone involved. Ongoing work aims to improve data, harmonize standards, and align reporting with net-zero goals.
Net zero is a major focus for many organizations. It means balancing any remaining emissions with removals or offsets. Initiatives like Race to Zero and the Science Based Targets initiative’s Net Zero program guide companies toward credible, long-term plans, while new standards and efforts aim to ensure that offsets are real and durable.
In short, carbon accounting helps organizations understand where their emissions come from, set and track reduction goals, and communicate their climate efforts clearly. With growing regulation, investor interest, and a push toward net zero, robust GHG accounting is becoming a core part of business and policy strategy.
This page was last edited on 3 February 2026, at 05:10 (CET).