How to Build a Net Zero Roadmap for ESG Reporting: Scopes, Targets and Milestones

Companies that commit to net zero without a concrete plan risk greenwashing allegations, regulatory penalties and investor skepticism. If you search for ESG net zero guidance, most results come from consultancies selling engagements, not open methodology. This guide gives you the full sequence: inventory your emissions across scopes 1, 2 and 3, set targets aligned with climate science, define interim milestones and structure everything for ESG disclosure.

What a Net Zero Roadmap Actually Is

A net zero roadmap is a documented plan that shows how an organization will reduce its greenhouse gas (GHG) emissions to as close to zero as feasible, and neutralize any residual emissions through permanent carbon removal. It is not the same as carbon neutrality, which allows unlimited offsetting of current emissions. The ISO Net Zero Guidelines (IWA 42:2022) define net zero as a state where no more than 10% of baseline emissions remain, balanced by durable removals.

The roadmap itself is a working document. It contains a GHG inventory baseline, reduction targets with timelines, the specific actions that will deliver those reductions, and the governance structure that keeps the plan on track.

How a Net Zero Roadmap Works Inside ESG Reporting

ESG frameworks increasingly require companies to disclose not just current emissions but forward-looking transition plans. The European Sustainability Reporting Standards (ESRS E1, under the CSRD) require disclosure of climate transition plans, including GHG reduction targets and the actions to achieve them. The IFRS Sustainability Disclosure Standards (IFRS S2, paragraphs 33-36) require disclosure of transition plans and how targets relate to the latest international agreement on climate change. A net zero roadmap is the operational backbone behind these disclosures.

Without a roadmap, your ESG report contains targets with no credibility mechanism. With one, each reported metric connects to a baseline, a reduction lever and a timeline.

Who Needs a Net Zero Roadmap

Any company that has made a net zero or emissions reduction commitment needs one. In practice, the following groups face the most pressure:

• Companies subject to the CSRD: approximately 50,000 companies in the EU must report under ESRS starting from fiscal year 2024 onward, with phased timelines by company size.
• Companies reporting under IFRS S2: jurisdictions adopting ISSB standards will require transition plan disclosures.
• Organizations with SBTi commitments: the Science Based Targets initiative (SBTi) requires companies to submit a near-term target within 24 months of commitment and a long-term net zero target.
• Listed companies facing investor pressure: Climate Action 100+ and similar initiatives evaluate companies on the quality of their transition plans.
• Supply chain participants: large buyers increasingly require scope 3 data and reduction plans from suppliers.

How to Build Your Net Zero Roadmap: Step by Step

Step 1: Conduct a GHG Inventory Across All Three Scopes

Measure your emissions using the GHG Protocol Corporate Standard (2004, revised) as the accounting framework. Organize emissions into three scopes:

• Scope 1: direct emissions from sources you own or control (fuel combustion, fleet vehicles, process emissions, fugitive emissions).
• Scope 2: indirect emissions from purchased electricity, steam, heating and cooling. Report using both the location-based and market-based methods as specified in the GHG Protocol Scope 2 Guidance (2015).
• Scope 3: all other indirect emissions in your value chain. The GHG Protocol Corporate Value Chain (Scope 3) Standard identifies 15 categories. Start with a screening assessment to identify which categories are material. For most companies, purchased goods and services (category 1), transportation (categories 4 and 9) and use of sold products (category 11) dominate.

Your inventory becomes the baseline year. Choose a year with representative operations and document any exclusions.

Step 2: Set Science-Based Targets

Align your targets with the SBTi Net-Zero Standard (version 1.0, October 2021). This standard requires two layers of targets:

• Near-term targets (5 to 10 years): reduce scope 1 and 2 emissions by at least 4.2% per year for a 1.5°C pathway. Scope 3 targets are required if scope 3 emissions exceed 40% of total emissions.
• Long-term net zero target (by 2050 at the latest): reduce emissions across all scopes by at least 90% compared to the baseline year. Residual emissions (no more than 10%) must be neutralized through permanent carbon dioxide removal.

Submit your targets to the SBTi for validation. The validation process typically takes several months. If you are not ready to submit, use the SBTi criteria as internal benchmarks, but do not claim your targets are “science-based” until validated.

Step 3: Identify Reduction Levers

For each scope, map the specific actions that will deliver reductions:

• Scope 1: electrification of processes, fuel switching, equipment efficiency upgrades, process redesign.
• Scope 2: renewable energy procurement (power purchase agreements, renewable energy certificates, on-site generation), energy efficiency measures.
• Scope 3: supplier engagement programs, product redesign for lower lifecycle emissions, logistics optimization, circular economy strategies.

Quantify the expected reduction from each lever and assign ownership within the organization.

Step 4: Set Interim Milestones

Break the path into checkpoints. A common structure uses five-year intervals: 2025, 2030, 2035, 2040, 2045, 2050. For each milestone, specify the cumulative reduction percentage, the levers that should be active by that point, and the capital investment required. Interim milestones make the roadmap auditable and allow course correction.

Step 5: Integrate the Roadmap into ESG Disclosure

Map your roadmap elements to the disclosure requirements of the frameworks you report under. For ESRS E1, this means disclosing your transition plan, GHG reduction targets (broken down by scope), decarbonization levers and expected financial effects. For IFRS S2, disclose how climate-related risks and opportunities connect to your transition plan and targets. Include your roadmap governance structure: who reviews progress, how often, and what triggers a revision.

Common Mistakes

• Ignoring scope 3: for most companies, scope 3 represents 70% or more of total emissions. A roadmap covering only scopes 1 and 2 lacks credibility.
• Relying on offsets instead of reductions: the SBTi Net-Zero Standard limits offsets to residual emissions after at least 90% reduction. A plan built on carbon credits instead of operational changes does not qualify as a net zero pathway.
• Choosing a baseline year that flatters the numbers: a year with unusually high emissions (such as a year with one-time construction) makes future reductions look easier. Auditors and rating agencies will flag this.
• Setting a 2050 target with no interim milestones: a distant goal with no near-term accountability is indistinguishable from no goal. Investors and regulators now expect 2030 targets at minimum.
• Treating the roadmap as a one-time exercise: your inventory, reduction levers and external context change. Review the roadmap annually and update targets when methodology evolves or business structure changes significantly.

What to Do Now

1. If you do not have a GHG inventory, start there. Use the GHG Protocol Corporate Standard and complete at least a screening-level scope 3 assessment.
2. If you have an inventory but no targets, use the SBTi Target Setting Tool (available at sciencebasedtargets.org) to model near-term and long-term reduction pathways.
3. If you have targets but no roadmap, build the document described in this guide: baseline, reduction levers with owners, five-year milestones, governance and disclosure mapping.
4. If you already have a roadmap, pressure-test it against the common mistakes above and check alignment with the latest version of the frameworks you report under.