ADR-40 Additional units for service-related Product Carbon Footprints

decisions/log/0040-service-carbon-footprint.md

@@ -0,0 +1,33 @@
+Date: 2024-10-21
+
+## Status
+
+Proposal shared.
+Call for consensus on Dec 18, 2024
+
+## Context
+Services are part of companies Scope 3 category 1 (Purchased goods and services). Therefore, accuracy on service carbon footprint is important. 
+
+While the range of services that companies may purchase can vary widely, and with them the variety of calculation approaches and declared units, two main group of services have been identified as being prominent across all sectors and business models: *Desk-based services* (such as consulting, legal, and marketing services) and *IT-related services* (such as software services).
+
+See for more information https://backlog.carbon-transparency.org/Explore-the-possibility-of-including-service-carbon-footprints-methodology-3a9e509d97114e058cbacac03a859b9f
+
+
+## Proposal
+Proposal to include 2 additional units of measurement into the data model for accounting for service-releated emissions.
+
+- **hour**: time in hours for Desk-based services
+- **MB**: amount of data used, transferred or stored for IT-related services, as a proxy to actual emissions. 
+
+## Rationale
+
+- Definition:
+    - Most comprehensible
+- Methodology:
+    - Balance between the effort and impact, i.e. SCFs are still quite lower than “good” PCFs, and therefore, it is not needed at this stage to create a full methodology
+
+## Consequences
+
+Forward-compatible, not backwards compatible, hence the inclusion in version 3.0.
+
+

spec/v3/index.bs

@@ -572,7 +572,7 @@ Advisement:
 
           Advisement: This property is optional in v2.3 but will be released in v3 as a mandatory attribute.
 
-The mass (in kg) of the product per the provided <{CarbonFootprint/declaredUnit|declared unit}>, excluding packaging.
+          The mass (in kg) of the product per the provided <{CarbonFootprint/declaredUnit|declared unit}>, excluding packaging.
           For example, if the declared unit is `piece`, this attribute MUST be populated with the mass of one piece (aka unit) of product.
           If the declared unit is `liter`, this attribute SHOULD be populated with the mass of 1 liter of product (i.e. the density of the product).
           If the declared unit is `kilogram`, this attribute SHOULD by definition be populated with `1`.
@@ -1276,7 +1276,9 @@ Each NonEmptyStringVector MUST be encoded as an array of [=NonEmptyStrings=].
 
 ## Data Type: <dfn enum>DeclaredUnit</dfn> ## {#dt-declaredunit}
 
-DeclaredUnit is the enumeration of accepted declared units with values
+DeclaredUnit is the enumeration of accepted declared units with values.
+
+Advisement: Additional units in version 3.0: `piece`, `MB`, `hour`
 
 <dl dfn-type="enum-value" dfn-for="DeclaredUnit">
 
@@ -1301,7 +1303,11 @@ DeclaredUnit is the enumeration of accepted declared units with values
 : <dfn>square meter</dfn>
 :: for square meter, the Derived Unit from SI Base Unit `metre`
 
-Advisement: v3 will also include the following `DeclaredUnit`: <dfn>piece</dfn>, for a piece, a unit of product
+: <dfn>mbps</dfn>
+:: Megabits per second, as a unit of data transfer related to IT services.
+
+: <dfn>hour</dfn>
+:: Hours for desk-based services.
 
 </dl>