Wagtail sites emissions dashboard

	B	C	D	E	F	G	H	J	K	L
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2	🐦 Wagtail sites’ carbon emissions							Data sources (all via HTTPArchive BigQuery):
3	Last updated: 2025-06-03							https://developer.chrome.com/docs/crux/
4	Data date: 2025-04-01							https://httparchive.org/
5	Model: SWDM v4 and SWDM v3							https://www.wappalyzer.com/
6	Carbon intensity: Ember 2024-2023 electricity data							Methodology references:
7	Analyst: Thibaud Colas, Torchbox							https://almanac.httparchive.org/en/2022/sustainability
8								https://sustainablewebdesign.org/calculating-digital-emissions/
9	- Based on publicly-available data: Chrome UX Report (CrUX), HTTP Archive, Wappalyzer, Ember							https://sustainablewebdesign.org/digital-carbon-ratings/
10	- Based on private Torchbox data for additional extrapolation factors (taken from Torchbox websites)							Methodology limitations:
11	- Following established methodology: HTTP Archive Web Almanac, Green Web Foundation							https://www.fershad.com/writing/is-data-the-best-proxy-for-website-carbon-emissions/
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13								Estimating emissions per page view
14								We derive emissions from page weight, similarly to other studies based on publicly-available data (0.81 kWh/GB).
15	👉 Key results - 2025			Rating	2025	2024	2023	For sites using a ccTLD, we extract Ember grid carbon intensity data for this country
16				A+	2.3%	3.4%	2.4%	Otherwise we apply a global grid carbon intensity factor to convert page weight into carbon-equivalent emissions (442gCO2e/kWh).
17	6431	Websites with public data		A	6.7%	8.9%	8.2%
18				B	17.7%	16.5%	16.6%	Estimating pageviews
19	2,905	Median site page weight (kb)		C	14.6%	13.2%	14.1%	We cross-reference CrUX ranks and available pageview data to extrapolate pageview figures for all sites
20	0.12	Median site emissions (tCO2e/year)		D	11.6%	16.8%	11.4%	Then multiply the carbon cost of one page view by how many there will be in 1 year
21	1.19	Average site emissions (tCO2e/year)		E	9.5%	9.0%	10.1%
22				F	37.6%	32.2%	37.2%	Tradeoffs
23	5,505	Total emissions (tCO2e/year)						The analysis is based largely on publicly-available data only, so the methodology only produces high-level numbers.
24				Metric				The carbon intensity only takes into account ccTLDs with a predetermined portion of traffic assigned to the target country, not real-world demographics
25				Median page weight				CrUX ranks -> pageviews are approximations which have value in aggregate but not for individual sites
26								We only survey websites’ homepages. Which tend to be the most-visited pages of sites, but also image-heavy.
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28								Related research
29								2024 Wagtail sites emissions dashboard
30								2023 Wagtail sites emissions dashboard
31								Sustainable Web Design emissions calculator as a spreadsheet
32								Data - Evaluating the carbon footprint of Django and Wagtail sites \| Django London
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59								Rating	Wagtail	Industry average
60								A+	3.4%	5.0%
61								A	8.9%	5.0%
62								B	16.5%	10.0%
63								C	13.2%	10.0%
64								D	16.8%	10.0%
65								E	9.0%	10.0%
66								F	32.2%	50.0%
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75			"Does my server actually use less energy when fewer people use it"
76			"what are those Fs doing / what should they be doing"
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86								Bar chart: Digital Carbon Ratings: how Wagtail sites score. April 2024 HTTP Archive data, SWDM v4, 2023-2024 Ember grid carbon intensity, 4889 websites. A+: 3.4%. A: 8.9%. B: 16.5%. C: 13.2%%. D: 16.8%. E: 9%. F: 32.2%
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88	YoY	Sites	Pageviews	tCO2e/year	Median page weight	Carbon intensity (avg gCO2e/kWh)
89	2023	4349	13,045,319,398	5,198.08	1,986	422
90	% 2023-2024	12.42%	18.83%	22.03%	-5.44%	-2.53%
91	2024	4889	15,501,665,301	6,343.40	1,878	411
92	% 2024-2025	31.54%	-31.09%	-13.22%	12.19%	-1.39%
93	2025	6431	10,682,957,022	5,504.5	2,107	405
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