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References and explanations on data used for the video and infographic
The idea is to compare the CO2 savings of the posts (since the beginning of the programme) with more tangible examples:
Example 1 - comparison to cities (video)
To date, posts have collectively saved 31m tonnes CO2 (Source: IPC Sustainability Report 2024) This is equal to the annual emissions of:
Kuala Lumpur (30.9 million tonnes)1
Johannesburg (29.1 million tonnes)2
Madrid (31 million tonnes)3
New York (35 million tonnes)4
Paris (30.7 million tonnes)5
Rome (30.6 million tonnes)6
Example 2 - comparison to cars/solar panels (infographic)
The emission savings made by the posts are equivalent to:
- Taking approximately 6.7 million average cars off the road for a year7
- The emissions saved by 31m solar panels a year8, generating enough energy for four million average European homes annually, or nearly 3.5% of the total annual electricity consumption of Germany9.
Notes
1. C40 Cities – Urban Climate Action Programme (UCAP CAI) City Fact Sheets, 2025 Figure based on 2022 GHG inventory, updated in June 2025, covering scope 1: Direct emissions from within the city (e.g., fuel combustion in buildings, vehicles) and scope 2: Indirect emissions from electricity and energy imported into the city.
2. 2023 projection, based on City of Johannesburg’s GPC inventories and Oxford Economics’ Global Cities Dataset, covering Scope 1: Direct emissions from within the city (e.g., fuel combustion in buildings, vehicles, and industry) and scope 2: Indirect emissions from electricity and energy imported into the city.
3. 2023 projection based on Madrid’s GPC (Global Protocol for Community-scale Greenhouse Gas Emission Inventories) and Oxford Economics’ Global Cities Dataset, covering scope 1: Direct emissions from sources within the city (e.g., fuel combustion in buildings, vehicles, and industry) and scope 2: Indirect emissions from electricity and energy imported into the city.
4. Projection for the year 2023, based on data from the city's GPC (Global Protocol for Community-scale Greenhouse Gas Emission Inventories) and Oxford Economics’ Global Cities Dataset. Scope 1 (Fuel combustion in buildings and vehicles/ Industrial processes within city boundaries). Scope 2 (Electricity, heating, and cooling consumed in the city but generated elsewhere).
5. 2023 projection derived from Paris’s GPC (Global Protocol for Community-scale Greenhouse Gas Emission Inventories) and Oxford Economics’ Global Cities Dataset, covering Scope 1: Direct emissions from sources within the city (e.g., fuel combustion in buildings, vehicles, and industry) and Scope 2: Indirect emissions from electricity and energy imported into the city.
6. 2023 projection derived from Rome’s GPC (Global Protocol for Community-scale Greenhouse Gas Emission Inventories) and Oxford Economics’ Global Cities Dataset, covering Scope 1: Direct emissions from sources within the city (e.g., fuel combustion in buildings, vehicles, and industry) and Scope 2: Indirect emissions from electricity and energy imported into the city.
7. According to the U.S. Environmental Protection Agency (EPA), the average passenger vehicle emits about 4.6 metric tonnes of CO₂ per year. 31,000,000 tonnes CO₂ equals to r≈6.74 million cars
2. 2023 projection, based on City of Johannesburg’s GPC inventories and Oxford Economics’ Global Cities Dataset, covering Scope 1: Direct emissions from within the city (e.g., fuel combustion in buildings, vehicles, and industry) and scope 2: Indirect emissions from electricity and energy imported into the city.
3. 2023 projection based on Madrid’s GPC (Global Protocol for Community-scale Greenhouse Gas Emission Inventories) and Oxford Economics’ Global Cities Dataset, covering scope 1: Direct emissions from sources within the city (e.g., fuel combustion in buildings, vehicles, and industry) and scope 2: Indirect emissions from electricity and energy imported into the city.
4. Projection for the year 2023, based on data from the city's GPC (Global Protocol for Community-scale Greenhouse Gas Emission Inventories) and Oxford Economics’ Global Cities Dataset. Scope 1 (Fuel combustion in buildings and vehicles/ Industrial processes within city boundaries). Scope 2 (Electricity, heating, and cooling consumed in the city but generated elsewhere).
5. 2023 projection derived from Paris’s GPC (Global Protocol for Community-scale Greenhouse Gas Emission Inventories) and Oxford Economics’ Global Cities Dataset, covering Scope 1: Direct emissions from sources within the city (e.g., fuel combustion in buildings, vehicles, and industry) and Scope 2: Indirect emissions from electricity and energy imported into the city.
6. 2023 projection derived from Rome’s GPC (Global Protocol for Community-scale Greenhouse Gas Emission Inventories) and Oxford Economics’ Global Cities Dataset, covering Scope 1: Direct emissions from sources within the city (e.g., fuel combustion in buildings, vehicles, and industry) and Scope 2: Indirect emissions from electricity and energy imported into the city.
7. According to the U.S. Environmental Protection Agency (EPA), the average passenger vehicle emits about 4.6 metric tonnes of CO₂ per year. 31,000,000 tonnes CO₂ equals to r≈6.74 million cars
8. According to multiple sources, including Heatable and Renewable Energy Hub, a typical residential solar panel saves about 1 tonne of CO₂ per year. 31,000,000 tonnes CO₂ equal to 31 million panels
9. The Green Watt