Skip to content
https://wikimediafoundation.org

Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
64
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.83g CO2 per view
FIX
2.83g CO2 per view
Critical::
2.83g CO2 per page view
This page transfers 10.0 MB, producing an estimated 2.83g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.52g, network 0.49g, end-user device 1.81g.
Got: 2.83g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 339.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 339.1 kg of CO2 annually — equivalent to charging 42384 smartphones.

2.83g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 10.0 MB

Your site
2.83g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.52g
Network
0.49g
End-user device
1.81g
At 10,000 monthly views: Monthly: 28.3 kg · Annual: 339.1 kg · ≈ 42384 smartphone charges
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.83g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.83g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 371% more
vs Target 465% more
B
Web Font Weight Variants
No detectable Google Fonts weights
REVIEW
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 35 KB (vs 10217 KB first visit). 87 of 88 resources are served from browser cache, saving 2.82g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.83g)
First visit
10217 KB
Repeat visit
35 KB

100% reduction on repeat visits

Saving 2.82g CO2 per returning visitor

87 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 327 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 327 KB (3% of page weight)

Unused JS 327 KB

0.09g unnecessary CO2 per visit

Actual transfer 10217 KB
Theoretical minimum 9889 KB
Potential savings 327 KB (0.09g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
63 images, 313 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

63

Total Size

313 KB

4 missing dimensions 7 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback