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The March 2009 memorandum of understanding (MOU) between BREEAM, LEED, Green Star and the UK Green Building Council was an announced attempt to make carbon reporting from new homes and buildings more consistent and comparable. Signed at EcoBuild’09 in London on March 3, 2009, it proposed a cross-system working group to map existing approaches and develop common metrics for CO2-equivalent emissions. The announcement records an intention to collaborate, not a completed universal carbon standard.
That distinction matters. The agreement is useful evidence of the pressure building professionals already felt to reconcile competing green-building rating tools, but the available announcement does not say that the working group finished its work, publish the resulting metrics or establish a method that every scheme subsequently adopted.
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What did the March 2009 agreement actually propose?
The MOU proposed cooperation among major green-building assessment organizations so that carbon emissions could be measured and reported on a more consistent basis. BRE’s announcement says the stated objective was:
“To map and develop common metrics to measure emissions of CO2 equivalents from new homes and buildings.”
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The wording comes from the MOU as quoted in BRE’s March 5, 2009 release, “BREEAM, LEED and Green Star sign MOU — Common Language for Carbon in Sight.” The proposal therefore had two linked parts: first, understand how the participating systems approached carbon; second, develop metrics and seek alignment in both measurement and reporting.
It was not presented as a new rating system, a replacement for BREEAM, LEED or Green Star, or a legally binding emissions rule for construction projects. It was a coordination initiative intended to make results from different tools easier to interpret alongside one another.
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BRE said the initiative responded to demand for greater consistency and comparability among green-building rating tools, particularly in the way they accounted for carbon emissions. A building could be assessed under more than one scheme, or its carbon claim could be read by owners, designers, investors and public authorities familiar with different schemes. If those systems used different boundaries, units, assumptions or reporting conventions, a score or emissions figure could be difficult to compare even when it appeared to describe the same building.
“Common language” is therefore best understood as a measurement and reporting problem. It does not necessarily mean that every rating tool would award the same points or produce one identical certification label. It means that the underlying carbon information would be described in terms that users could recognize across systems.
In practical carbon accounting, alignment could involve questions such as which parts of a building’s emissions are included, what project stage is being assessed, how emissions are expressed, and how the result is disclosed. Those are useful examples of the issues a metrics project might examine; the 2009 announcement does not specify that the MOU settled any of them. Readers should not infer a particular boundary, conversion factor or life-cycle method from the announcement alone.
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Who signed the MOU?
The announcement identifies four participants, although they did not all occupy the same institutional role.
| Participant | Role described in the announcement | Scope represented |
|---|---|---|
| BREEAM | Owned by the BRE Trust and operated by BRE Global | Building assessment methodology associated with the United Kingdom and international use |
| LEED | Developed and managed by the U.S. Green Building Council | U.S.-origin rating system with international use |
| Green Star | Developed and administered by the Green Building Council Australia | Australian rating system |
| UK Green Building Council | Signatory organization supporting the collaboration | United Kingdom green-building sector representation |
This composition is important because the MOU was not a bilateral arrangement between two similar products. It brought together three rating tools associated with different national or organizational contexts, plus a sector body from the United Kingdom. The announcement’s descriptions identify who developed, managed or operated each system, but do not provide a technical comparison of their scoring categories or carbon calculations.
When and where was the agreement announced?
The MOU was signed on Tuesday, March 3, 2009, at EcoBuild’09 in Earls Court, London. BRE’s public announcement is dated March 5, 2009. The event setting explains why the announcement was framed as an industry-wide step toward a shared approach: the signatories used a major building and environmental forum to publicize an effort involving systems used in different markets.
The dates should be kept separate when the agreement is cited. March 3 is the signing date given by BRE; March 5 is the date of the release reporting it. Neither date indicates when a final set of metrics was published.
How was the proposed working group supposed to work?
The announced mechanism was a working group with representatives from each rating tool. Its task was to develop metrics and seek alignment in measurement and reporting. The release does not name a chair, timetable, technical protocol or final decision-making process, so the safest description is a proposed collaborative work programme rather than an operational standard-setting body.
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- Map existing approaches. Representatives would first identify how the participating systems addressed CO2-equivalent emissions. Mapping is essential when the immediate problem is inconsistency: it reveals whether two tools are measuring the same thing under different names or measuring different things altogether.
- Identify opportunities for common metrics. The group would then develop metrics that could provide a shared reference point. The announcement does not define those metrics, so it cannot support claims about a particular emissions boundary, life-cycle stage or calculation method.
- Seek alignment in measurement. Alignment would concern how emissions are quantified. A shared approach could make figures more interpretable across schemes, but the release does not say that the signatories agreed to identical calculations.
- Seek alignment in reporting. Even comparable calculations can be hard to use if they are reported differently. The working group was also expected to address how results would be presented, which is why the announcement refers to both measurement and reporting.
This sequence describes the announced intent. It should not be rewritten as evidence that each step was completed.
What does “CO2 equivalent” mean in this context?
CO2 equivalent, commonly written as CO2e, is a way to express the climate effect of emissions in a common carbon-dioxide-equivalent unit. Using a common unit can help readers compare different emission sources without having to interpret a separate number for every gas. The phrase in the MOU is therefore about creating a shared basis for reporting emissions from new homes and buildings.
However, a CO2e figure is only comparable when the accounting rules behind it are also understood. Two figures can use the same unit while covering different parts of a project or different periods of a building’s life. The 2009 announcement recognizes the need for common metrics but does not publish the accounting rules needed to interpret a specific project result.
Would a common metric have made BREEAM, LEED and Green Star equivalent?
No. A common carbon metric would not automatically make the three rating systems interchangeable. Rating tools can share a way of describing emissions while retaining different credit structures, prerequisites, documentation requirements and broader environmental categories.
The likely benefit would have been a clearer carbon layer across otherwise distinct systems. For example, a developer comparing assessments could potentially understand whether reported emissions used a comparable basis before drawing conclusions. That is an analytical benefit, not proof that the systems would give a project the same rating or certification outcome.
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The announcement itself limits the comparison axes to consistency of carbon accounting, comparability of results, the emissions metrics used, and consistency in measurement and reporting. It does not provide a side-by-side scorecard, thresholds or conversion table for the three tools.
Did the MOU create a universal building-carbon standard?
The available source does not establish that it did. BRE reports the signing, the rationale, the objective and the proposed working group, but it does not report a completed set of metrics or a later implementation decision. No current universal standard should be attributed to this announcement without separate evidence.
This is the central qualification for anyone citing the agreement. “Signed an MOU to map and develop common metrics” is accurate. “Created a universal carbon-accounting standard used by BREEAM, LEED and Green Star” goes beyond what the release supports. The announcement also does not establish whether all four organizations later used identical definitions, required the same disclosures or maintained a common database.
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Use it as evidence of an important industry objective in 2009, not as a substitute for the rules of a current assessment scheme. A project team reviewing an old specification, policy paper or sustainability claim can apply the following checks:
- Identify the scheme and edition. Record whether the document refers to BREEAM, LEED or Green Star and identify the scheme version and publication date. The MOU does not tell you which later editions, if any, incorporated shared metrics.
- Read the carbon boundary. Check whether the figure covers operational emissions, embodied emissions, a defined life-cycle stage or another boundary. Do not assume that the term CO2e defines the scope.
- Check the reporting unit and basis. Note whether the result is presented for a building, floor area, year, material quantity or another basis. A shared unit is useful only when the denominator and period are also clear.
- Separate a rating from an emissions figure. A certification level or credit total is not automatically a directly comparable carbon quantity. Find the underlying calculation or disclosure.
- Look for verification requirements. Determine who prepared the calculation, what evidence was required and whether an assessor or other reviewer checked it. The 2009 announcement does not set verification rules.
- Date the evidence. Keep the 2009 MOU, later scheme manuals and project-specific calculations as separate sources. This prevents a historical statement of intent from being mistaken for a current requirement.
These checks do not claim that the MOU prescribed a particular method. They are a way to avoid overstating what a historical cooperation announcement can prove.
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What can the 2009 announcement support—and what can it not support?
| The announcement supports | The announcement does not establish |
|---|---|
| That BREEAM, LEED, Green Star and the UK Green Building Council signed an MOU at EcoBuild’09 in London on March 3, 2009. | That a final common metric was published. |
| That BRE described industry demand for consistency and comparability in carbon accounting. | That the participating systems subsequently adopted identical carbon calculations. |
| That the objective was to map and develop common metrics for CO2-equivalent emissions from new homes and buildings. | That the initiative produced a universal standard, mandatory rule or common certification. |
| That a working group with representatives from each rating tool was proposed. | That the working group completed its work, met on a stated timetable or issued a final report. |
This evidence boundary is not a minor footnote. It determines how the agreement should appear in specifications, research papers and corporate sustainability histories. The MOU can document an attempt to improve comparability; it cannot, by itself, validate a present-day carbon claim.
Why does the phrase “common language for carbon” still matter?
The phrase captures a recurring problem in sustainable construction: people may agree that carbon should be measured while still using different definitions and reporting conventions. A common vocabulary is a prerequisite for comparison, but vocabulary alone does not guarantee comparable results. The technical rules, data quality, boundaries and verification behind each number remain decisive.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsThe 2009 initiative also shows that comparability was being treated as a cross-system issue rather than the responsibility of one rating tool. By bringing together organizations associated with the United Kingdom, the United States and Australia, the MOU acknowledged that buildings and their supply chains operate across markets. Its significance lies in the attempt to coordinate the language used to describe emissions, even though the available record stops at the announcement of that attempt.
What is the careful conclusion?
The March 2009 MOU was a credible, clearly stated effort to explore common carbon metrics for new homes and buildings. It responded to a real need for consistency among BREEAM, LEED and Green Star and proposed a representative working group to align measurement and reporting. The source does not show what happened after the announcement, so the agreement should be cited as an announced collaboration and historical milestone—not as proof of a completed or currently universal carbon standard.
Frequently Asked Questions
Did the announcement publish the actual carbon metrics?
No. The release states the objective of mapping and developing metrics but does not define the metric formulas, emissions boundaries, conversion factors or reporting templates. Any project-level number needs to be traced to the relevant scheme documentation or calculation method instead.
Can a project claim compliance with the 2009 MOU?
Not on the strength of the announcement alone. The MOU describes cooperation among organizations; it does not state a project certification rule, compliance test or mandatory disclosure. A specification should cite the applicable assessment scheme and edition rather than treating the MOU as a standalone requirement.
Why is an MOU different from a technical standard?
An MOU records an agreement to cooperate toward stated objectives, while a technical standard normally provides defined requirements that users can apply and assess. The BRE release describes the former: an intended mapping and metrics exercise, without publishing enforceable calculation rules.
Does the source include a quote from a named executive?
No. The quoted objective is attributed to the MOU itself, not to an identified individual. The announcement’s evidentiary value comes from its description of the signatories, purpose and proposed working group.
