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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
55
GRADE
D
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.48g CO2 per view
FIX
2.48g CO2 per view
Critical::
2.48g CO2 per page view
This page transfers 8.8 MB, producing an estimated 2.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.46g, network 0.43g, end-user device 1.59g.
Got: 2.48g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 298.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 298.0 kg of CO2 annually — equivalent to charging 37254 smartphones.

2.48g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.8 MB

Your site
2.48g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.46g
Network
0.43g
End-user device
1.59g
At 10,000 monthly views: Monthly: 24.8 kg · Annual: 298.0 kg · ≈ 37254 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::
2.48g 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

2.48g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 314% more
vs Target 397% more
B
Transfer Efficiency
88% efficient
REVIEW
88% efficient
Info::
Transfer efficiency: 88%
An estimated 1059 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1059 KB of unused JavaScript. This wasted data produces 0.29g of unnecessary CO2 per page view.
88% efficient

Total waste: 1059 KB (12% of page weight)

Unused JS 1059 KB

0.29g unnecessary CO2 per visit

Actual transfer 8980 KB
Theoretical minimum 7920 KB
Potential savings 1059 KB (0.29g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 219 KB (vs 8980 KB first visit). 111 of 115 resources are served from browser cache, saving 2.42g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 2.48g)
First visit
8980 KB
Repeat visit
219 KB

98% reduction on repeat visits

Saving 2.42g CO2 per returning visitor

111 resources served from cache · 4 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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