The sequence matters more than most companies realize when they first engage with climate strategy. Carbon offsets — verified emission reductions or removals purchased to compensate for a company's own emissions — have become a substantial market. Voluntary carbon credit registries collectively issued hundreds of millions of tonnes of CO₂e credits in 2023 alone. But the credibility of any offset purchase rests entirely on the quality of the baseline it is measured against. Without a robust, documented carbon inventory, an offset purchase is not a climate action — it is a financial transaction without a defined problem statement.
Why the Order of Operations Matters
Accounting and offsetting are not equivalent activities. Carbon accounting — building a GHG Protocol-aligned inventory of Scope 1, 2, and 3 emissions — tells you what your actual footprint is, by source and by boundary year. Carbon offsets — whether forest conservation credits, renewable energy projects, or direct air capture — claim to reduce or remove emissions elsewhere in the economy. The IPCC AR6 Working Group III makes clear that carbon dioxide removal is a necessary component of net-zero pathways, but it is complementary to emission reductions, not a substitute for them.
Consider a straightforward scenario: a logistics company with a fleet of diesel vehicles purchases 10,000 tonnes of CO₂e in reforestation credits and publishes a "carbon neutral operations" announcement. Without a verified Scope 1 inventory, there is no documented basis for that 10,000-tonne claim. The actual fleet footprint could be 7,000 tonnes or 14,000 tonnes. If it's 14,000 tonnes, the company has published a materially incorrect climate claim — an increasingly consequential risk as greenwashing enforcement accelerates under EU Directive 2024/825 on empowering consumers and as the FTC Green Guides are updated.
The Baseline Problem
A verified GHG inventory is not a formality preceding the "real" work of offset procurement. It is the mechanism by which a company establishes: how large its footprint actually is; which emission sources are biggest and therefore where reduction investments will have the most impact; and what a credible reduction trajectory looks like against a defined base year.
The GHG Protocol Corporate Standard requires a base year to be selected and recalculated if structural changes (acquisitions, divestitures, methodology changes) alter comparability. Without a documented base year inventory, you cannot demonstrate reduction — you can only assert it. SBTi's Near-Term Criteria require a base year no earlier than 2015 for science-based targets, with the base year inventory documented per GHG Protocol. Companies that skip this step and purchase offsets first have no base year to set targets against.
The measurement-first principle is not idealism. It has direct audit implications. ESRS E1-6 requires disclosure of gross Scope 1, 2, and 3 emissions before any carbon credit removals are factored in. Under CSRD, a company cannot net its offset purchases against its emission figures — the standard explicitly requires separate disclosure of gross emissions (E1-6) and GHG removals and carbon credits (E1-7). That structural separation reflects a deliberate policy choice: regulators do not want offsets obscuring actual emission performance.
What "Offset-First" Gets Wrong About Risk
There is a second-order problem with purchasing offsets before establishing a baseline: it creates a perverse incentive to avoid accurate measurement. If a company has publicly claimed carbon neutrality based on 10,000 tonnes of purchased credits, subsequently discovering that its actual footprint is 18,000 tonnes — perhaps after a Scope 3 Category 1 inventory reveals substantial supply chain emissions — creates a reputational and legal exposure rather than a data improvement. The disclosed figure was wrong, and the company knew (or should have known) it was buying credits without a verified basis.
We're not saying carbon credits are bad instruments — well-structured, third-party-verified credits under standards like Gold Standard or Verra VCS do represent real climate value. The problem is sequencing them before measurement. A company that builds its inventory first, sets SBTi-aligned reduction targets second, and then purchases high-quality credits to address only the residual emissions it cannot yet eliminate is engaged in a defensible, auditable climate strategy. The same company purchasing credits first to claim neutrality before any of those steps is not.
The Regulatory Trajectory Is Clarifying This
Regulatory developments through 2025 and into 2026 have progressively tightened the rules around climate claim substantiation. The EU's Green Claims Directive (proposed 2023, advancing through legislative process) would require explicit scientific substantiation for environmental claims and prohibit claims that rely on offsetting to assert neutrality without underlying emission reductions. In the UK, the FCA's SDR regime for investment products distinguishes between "sustainable" and "responsible" labels based on the extent to which claims are grounded in verified data.
The California Air Resources Board's regulations under SB 253 (Climate Corporate Data Accountability Act) require large companies doing business in California to disclose Scope 1, 2, and 3 emissions beginning in 2026 and 2027 respectively — verified by an independent third party. For companies subject to SB 253, an offset purchase without a verified inventory is not a compliance option.
The trajectory is consistent: measurement first, substantiated claims second. Companies building carbon inventory infrastructure now are not running ahead of the market — they are positioning themselves to meet requirements that are already enacted or are in advanced legislative stages across the US, EU, and UK simultaneously.
A Practical Sequence for Climate Strategy
For a company starting from scratch, a defensible climate strategy follows this order: establish an organizational boundary and base year; build a Scope 1, 2, and material Scope 3 inventory for that base year using GHG Protocol methodology; identify the highest-emission sources and model reduction options (fuel switching, energy efficiency, supplier engagement); set time-bound reduction targets aligned with a recognized framework (SBTi or equivalent); and only then determine what residual emissions warrant offset investment in the near term while longer-duration reductions are implemented.
That sequence can be compressed for a company with a pressing CSRD deadline or investor expectation — but it cannot be reversed. The inventory is the foundation. Everything else — targets, offsets, public claims, regulatory filings — is built on it. Skipping it doesn't accelerate the climate strategy; it puts the entire structure at risk.