One17
Singapore & APAC · GHG Protocol · ISO 14064

Sustainability advisory
that stands up to scrutiny

We help organisations make sustainability practical, clear and defensible. Real emission sources, audit-ready evidence and simple processes that work in day-to-day operations.

Scope 1–3
Full coverage
GHG Protocol
Methodology standard
Verification
Experience
Our Practice Areas
Singapore · APAC
◈
ESG & Carbon Training
Scenario-based training focused on real emission sources, evidence and defensible reporting.
Scenario-BasedScope 1–3
◎
Reporting & Disclosure
What to report, how to structure it and how to avoid unnecessary complexity.
Audit-ReadinessCustomer QRs
⊜
Carbon Accounting & GHG
Defensible Scope 1, 2 and 3 accounting with evidence systems that hold up under verification.
Scope 1Scope 2Scope 3
GHG Protocol · ISO 14064● Verification Experience
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The Problem

Most Sustainability
Reporting Gets Done
in the Wrong Order

Organisations start with frameworks and templates before they understand their actual emission sources. The result is reporting that looks complete but doesn't survive external scrutiny.

"The gap between reported figures and verifiable figures is wider than most organisations realise - until the auditor asks."

One17 Verification Experience
73%
of CFOs cite data quality as their top ESG reporting barrier
2026
ISSB S2 mandatory disclosure deadline for major Asian markets
Boundaries defined without understanding what's material
Inclusion decisions made to tick boxes, not to reflect actual emission sources
Evidence gaps that only surface at audit time
Data that looked fine internally fails under third-party scrutiny
Systems too complex for the team to maintain
Over-engineered frameworks that break down the moment someone leaves
Customer questionnaires answered inconsistently
Different answers to the same question depending on who responds
Scope 3 numbers that can't be reconstructed or defended
Figures in the report with no traceable evidence behind them
Reporting built around templates, not actual operations
Disclosure that passes a checklist but doesn't reflect how the business runs
What We Do

Three core carbon advisory services

Advisory - no software, no dashboards, no tools pushed for their own sake. We work with your data, your team and your actual reporting requirements.

◈

ESG & Carbon Management Training

Practical, scenario-based training focused on real emission sources, evidence and defensible reporting. Designed for teams who need to understand what they're reporting and why - not just how to fill in a template.

Scenario-BasedScope 1–3Evidence-Focused
◎

Sustainability Reporting & Disclosure Advisory

Guidance on what to report, how to structure it and how to avoid unnecessary complexity. We help you respond to customer questionnaires, supplier requirements and regulatory disclosure without over-engineering the process.

Customer QRsAudit-ReadinessDisclosure Structure
⊜

Carbon Accounting & GHG Advisory

Clear, defensible Scope 1, 2 and 3 accounting. We set boundaries correctly, close data gaps and build evidence systems that stand up under verification - because we've been on the verification side.

Scope 1Scope 2Scope 3
OneCarbon

Our structured GHG inventory methodology — every emission source traceable, every factor documented, every number ready to defend under verification.

View methodology →

All work is GHG Protocol and ISO 14064 aligned. Advisory - no software licensing, no platform fees.

Industry Experience

Carbon advisory across key sectors

Each sector has its own emission sources, data constraints and reporting expectations. We know the detail - what is material, what is noise and where the evidence gaps typically sit.

⌂
Real Estate
Multi-asset portfolio emissions across tenants, common areas and embodied carbon
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⬡
Manufacturing
Production line Scope 1, 2 and 3 emissions with full supply chain traceability
+
△
Logistics
Fleet, freight and last-mile emissions across distributed networks
+
◇
Hospitality
Energy, F&B, and guest-related emissions across multi-property groups
+
⊕
Supply Chain
Upstream and downstream reporting at scale
+
◉
Energy & Utilities
Stationary combustion, grid emissions and fuel accounting across facilities
+

Click any sector to see where the accounting complexity sits →

Why Work With One17

We've been on the other side of the audit

Four things that distinguish how we work - and why it matters for clients who need their sustainability to actually hold up.

01 / 4

Experienced Verifiers

We understand how auditors think because we've been on the verification side. This means we help clients avoid mistakes before they become findings - not after the audit report arrives.

What this means in practice
We know what verifiers look for and where they push back
We help you build evidence before you need to defend it
No surprises at disclosure time
We respond to all enquiries within one business day. Get in touch →
Get in Touch

Start the conversation

We work with sustainability leads, finance teams and operations managers. Tell us what you're trying to get right and we'll tell you how we can help.

01
Discovery call
We understand your reporting setup, your requirements and where the gaps are.
02
Advisory scoping
We identify what work is needed and what it will take to get your reporting right.
03
Clear engagement
Defined scope, practical plan, no over-engineering. We get started.
Response time
We respond to all enquiries within one business day.

We respond within one business day.