Methane evidence: are the numbers answering the same question?

Welcome

Two methane figures can describe different things even when both are credible. Before comparing them, write down what was observed, what was estimated and which boundary each number covers. This edition offers a desk-based checklist for a non-confidential study brief.

Today

1. Compare the measurement basis, not just the number.
2. Separate a regional inventory from a site observation.
3. Turn a mismatch into a verification question.

Operator brief — evergreen evidence, not breaking news

1. AER surveillance lessons: its December 2025 page describes inspector validation of aerial observations and the importance of testing detection technology performance. For a study brief, capture the method and detection limitations alongside the result. [1]

2. ECCC methodology example: its May 2024 technical overview explains how atmospheric observations and models inform top-down estimates, while bottom-up inventories combine several source-level inputs. This is historical methodology context, not a statement of today’s emissions or current regulatory requirements. [2]

3. AER learning resources: Module 2 covers quantification approaches and allocating emissions to facilities and sites. The page also directs readers to the underlying directives and manuals; an introductory module is not a substitute for checking the applicable current documents. [3]

Tool to try — AER Air Emissions Modules

Use: find the regulator’s introductory learning resources about emissions quantification.
Limitation: the linked resource was reviewed; the interactive module was not independently tested, and this is not a compliance assessment.
Practical application: add method and facility-boundary questions to your evidence checklist before commissioning a comparison. [3]

From the field — a fictional comparison

Imagine a public regional annual estimate beside a short-duration observation at one facility. A difference between the numbers alone does not establish that either is wrong: the geography, period and estimation basis differ. That is a reason to seek compatible evidence before drawing a conclusion.

For example, a briefing table could contain: claim; unit; period; geographic or equipment boundary; measured versus estimated; method; source; and uncertainty or missing information. This is an editorial planning template, not a measurement protocol or instruction to alter equipment.

Put it to work

1. Write the non-confidential question you want the evidence to answer.
2. Copy each reported unit and time period without converting missing information into assumptions.
3. Record the boundary and method explicitly.
4. Mark incompatible entries as “not directly comparable.”
5. Ask the source owner or appropriate reviewer what additional evidence would make a comparison valid.

Prompt station

Using only these permitted non-confidential notes, create a table of claim, unit, period, boundary, measured/estimated/unknown, method, source and missing evidence. Flag entries that cannot be directly compared. Do not invent values, citations or compliance conclusions, and do not recommend equipment changes. Notes: [insert permitted notes].

Check every output against the original sources. Keep confidential operating and customer information out of the prompt.

Your ETSS topic

We develop pre-FEED Engineering Technology Selection Study (ETSS) draft proposals for small independent Alberta and British Columbia oil-and-gas businesses. Send a non-confidential project decision and your main constraint to feedback@darkfactorymaker.com. AI clarifies your requirements and prepares a bounded scope, deliverables, assumptions and proposed commercial terms. Engineering companies, EPCs, Obsidian Engineering, Tetra Tech and their affiliates are outside this prospecting campaign.

Proposals are non-binding drafts, subject to approval by Singularity Engineering Canada Ltd. human oversight. If you indicate acceptance, the exact proposal is referred to Patrick Law and Patricia Manaog for approval before any binding commitment or paid work. Customer acceptance does not authorize billing or technical use. Previously agreed free-study commitments remain honoured; there is no blanket free-study offer or automatic billing.