The Climate Score methodology accounts for almost all types of consumption which are part of the consumption in households. Therefore, the Climate Score assessment (24h guest eq. CO2e-impact) can be compared to the emissions in households (citizen CO2e-impact). This indicative comparison serves to provide a reference when talking about emissions per person per day for the average traveler to understand.
When comparing these emissions, to ensure that the material and energy that flows into the two systems fulfills the need for reasonable completeness, it is necessary to be aware of a list of industries and sectors that contribute to national emissions which are not included in the Climate Score methodology. This includes societal emissions, such as hospitals, the educational system etc. and all air and water transportation methods, which are not included in the Climate Score methodology. This is illustrated in the figure and must be explained and kept in mind when communicating this comparison.
For Denmark alone, various estimates of emissions from the average Danish citizen’s consumption abound. One report pegs the emission at 11 tons of CO2e per person per year, while another suggests it’s 19 tons per year. The latest report from Concito, employing Exiobase, estimates the average Dane emits 13 tons of CO2e annually. Despite different years in these reports, the results and methodologies significantly vary. The challenge lies in identifying a method and data source that closely aligns with the system boundaries of the Climate Score. The method most comparable across countries, while promoting transparency, is Exiobase.
“EXIOBASE is a global, detailed Multi-Regional Environmentally Extended Supply-Use Table (MR-SUT) and Input-Output Table (MR-IOT)”
To compare a guest’s emissions at a specific hotel using the Climate Score methodology against the average citizen’s emissions, we identify emission categories excluded from the Climate Score. Subtracting these from the average citizen’s emissions allows us to assess whether a guest emits more or less CO2e compared to the average citizen when evaluated using the Climate Score methodology. Using Exiobase, all consumption-related emissions in Denmark equal 73 MtCO2e (33.9 kg CO2e per Dane per day). Examining the industries and sectors affecting a Dane’s emissions, 79% of total Danish consumption is covered by industries emitting more than 0.12 MtCO2e, our threshold value.
Adjusting the threshold value for other countries based on when more than 75% of all emissions are covered, we find that 10.63 MtCO2e of the 73.86 MtCO2e in Denmark originates from industries not included in the Climate Score methodology.
As a result, when removing categories from relevant industries and sectors, emissions for Denmark within the Climate Score methodology are 63.23 MtCO2e (29.6 kg CO2e per Dane per day), including the construction of buildings in the value chain, such as factories and plants, which contribute to emission factors for all hotel input data, even though the hotel building’s construction itself is not part of the methodology.
This figure can be compared to the CO2e-impact assessment using the Climate Score methodology. While the comparison is the best possible, it’s important to note its limitations, as most of the Climate Score impact relies on primary physical and financial data, with Exiobase emission factors used marginally. It serves as a benchmark or reference to communicate the impact to the public, with no claims made in terms of percentages or similar without referencing the methodology description. However, it’s crucial to be aware that the comparison only considers a 24-hour stay at the specific hotel with on-ground transportation, excluding flights or other societal impacts. Thus, it provides no indication of the total emissions for a tourist’s emissions in general.
While other sources and methods may offer alternative comparisons and emission figures for households, this choice is made for transparency, given that Exiobase data is publicly available.
Method adheres to ISO-14040 and ISO-14044.
The method described here is included in the full scientific methodology report which has been reviewed by three panel members from three international climate institutions. The Critical review process was completed in January 2024 to verify that the methodology adheres to ISO-14040 and ISO-14044. The full report with a more detailed calculation example for the Danish hotel industry can be found here: LINK