A Practical Guide to Scope 3, SBTi, and the GHG Strategy That Actually Holds Up

 GHG Protocol: Greenhouse gas emissions are categorised into three scopes.

Most companies that set a net-zero target make the same mistake: they commit to the destination without mapping the road. The ambition is real, the intention is good, but when a customer, investor, or framework like CDP or EcoVadis asks them to explain the methodology behind their goal, the answer falls apart.

This is not a small company problem. It is happening across industries, at every level of the supply chain. And the reason almost always traces back to the same gap: Scope 3 emissions the largest, most complex, and most consequential part of any company's carbon footprint have not been properly measured, understood, or planned for.

This article is a practical guide to understanding what Scope 3 actually is, why it is so difficult to manage, and what your organisation needs to do to build a climate strategy that can withstand scrutiny from your customers, your frameworks, and the market.

What Is Scope 3 — and Why Is It So Hard?

Greenhouse gas emissions are categorised into three scopes under the GHG Protocol — the global standard for measuring corporate emissions.

Scope 1 covers direct emissions from your own operations — fuel burned in company-owned facilities or fleet vehicles, for example.

Scope 2 covers indirect emissions from purchased energy — the electricity or heat your company buys and uses.

Scope 3 covers everything else. It includes upstream emissions from your supply chain — raw materials, manufacturing, logistics, and downstream emissions from how your customers actually use and eventually dispose of your products or services.

For most companies, Scope 3 accounts for more than 70% of their total carbon footprint. A food manufacturer's Scope 3 includes the agricultural emissions of every ingredient it buys. A logistics company's Scope 3 includes the emissions generated when a client ships goods using their service. A retailer's Scope 3 includes what happens to every product it sells after it leaves the shelf. Setting a credible net-zero Scope 3 target means committing to change not just what you do, but what happens across your entire value chain — an extraordinarily complex undertaking that depends on forces well beyond your direct control.

This is precisely why so many companies are struggling with Scope 3 today — and why targets set without a proper measurement baseline are increasingly becoming a liability rather than an asset.

Ambition Is Not the Problem — The Absence of a Credible Pathway Is

The most common mistake in corporate climate strategy is not lack of commitment. It is the gap between what a company publicly pledges and what it can actually substantiate. Announcing a 2050 net-zero goal without a documented, science-informed pathway to get there is not a strategy, it is a liability waiting to be exposed.

The distinction that matters is between aspirational targets and defensible targets. A defensible target is one backed by a complete emissions baseline, a valid ated reduction methodology, sector-specific decarbonisation pathways, and near-term milestones that demonstrate real progress well before 2050. An aspirational target without those foundations may satisfy a press release but will not satisfy a CDP evaluator, an EcoVadis scorecard, a procurement team doing supplier due diligence, or an investor asking for a transition plan.

The problem with ambitious but unstructured net-zero targets is not ambition. The problem is when targets are not grounded in a credible, science-informed pathway. That gap is where reputational risk, investor scrutiny, and regulatory exposure live.

What Science-Based Targets Actually Require

This is where the Science Based Targets initiative (SBTi) becomes essential context. SBTi provides companies with a validated framework for setting emissions reduction targets that are genuinely aligned with climate science — specifically, with limiting global warming to 1.5°C or well below 2°C.

An SBTi-validated target is not just a number your marketing team endorses. It is a commitment reviewed by independent experts against sector-specific decarbonisation pathways, with specific near-term milestones (typically by 2030) that demonstrate you are on a credible trajectory toward a long-term net-zero goal.

This rigour is what makes the difference when it matters most. For companies without SBTi validation, the problem arrives quietly — through investor questionnaires, CDP disclosure responses, EcoVadis assessments, or customer supply chain requests. The question "how is your target aligned with climate science?" is no longer a theoretical one. It is being asked right now, across industries, at every tier of the supply chain.

What CDP and EcoVadis Are Actually Measuring

If you are responding to CDP or submitting an EcoVadis questionnaire, both frameworks are directly probing the credibility and specificity of your climate targets.

CDP's Climate Change questionnaire asks not only whether you have emissions reduction targets, but whether those targets are science-based, what your Scope 1, 2, and 3 baseline looks like, and how your governance structures are holding leadership accountable for progress.

EcoVadis evaluates your environmental performance — including climate commitments, measurement methodology, and reporting quality — across a weighted scorecard that increasingly penalises vague intent and rewards documented, third-party-validated action.

In other words: a headline target without a credible, structured, science-informed methodology behind it does not help your score. It can actually hurt it if evaluators determine the target lacks substance.

What Your Organisation Should Do Now

The question every organisation needs to ask itself right now is a straightforward one: do we have targets that we can actually defend — to our customers, our investors, and the frameworks that evaluate us?

Here is where to start:

Measure first. You cannot manage what you have not measured. A complete GHG inventory (Scope 1, 2, and most critically Scope 3) gives you the factual foundation every framework and every customer will eventually ask for.

Set targets you can substantiate. Near-term SBTi targets for 2030 are more credible, more actionable, and more valued by buyers and investors than aspirational 2050 pledges without a roadmap.

Disclose transparently. CDP and CSRD-aligned reporting are becoming market expectations, not optional exercises. Companies that disclose accurately — including honest progress against targets — build more trust than those who overpromise and under-report.

Treat Scope 3 as a strategic priority, not a compliance checkbox. Understanding your value chain emissions opens doors to supplier engagement, procurement decisions, and product design conversations that can differentiate your business in a market where buyers are under increasing pressure to demonstrate their own supply chain credentials.

The companies that will emerge strongest from this decade are not necessarily the ones with the boldest headlines. They are the ones who chose rigour over optics — who built a climate strategy grounded in real data, honest baselines, and targets they could actually defend when someone looked closely. That distinction, between honest climate strategy and inflated pledges, is increasingly what separates leaders from laggards in supply chain evaluations, investor assessments, and ESG scorecards.

If you are navigating your Scope 3 baseline, building your first SBTi commitment, preparing a CDP response, or working toward an EcoVadis improvement, we are here to help you do it right.

Connect with us at hello@ecovantagesupport.com — let's build a strategy you can stand behind.