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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
53
GRADE
F
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
2.49g CO2 per view
FIX
2.49g CO2 per view
Critical::
2.49g CO2 per page view
This page transfers 8.8 MB, producing an estimated 2.49g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.46g, network 0.43g, end-user device 1.60g.
Got: 2.49g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 298.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 298.4 kg of CO2 annually — equivalent to charging 37298 smartphones.

2.49g

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
2.49g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.46g
Network
0.43g
End-user device
1.60g
At 10,000 monthly views: Monthly: 24.9 kg · Annual: 298.4 kg · ≈ 37298 smartphone charges
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Not identified✗CDN Varnish✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.49g 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

2.49g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 314% more
vs Target 397% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 977 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 977 KB of unused JavaScript. This wasted data produces 0.27g of unnecessary CO2 per page view.
89% efficient

Total waste: 977 KB (11% of page weight)

Unused JS 977 KB

0.27g unnecessary CO2 per visit

Actual transfer 8991 KB
Theoretical minimum 8013 KB
Potential savings 977 KB (0.27g 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 268 KB (vs 8991 KB first visit). 617 of 704 resources are served from browser cache, saving 2.41g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 2.49g)
First visit
8991 KB
Repeat visit
268 KB

97% reduction on repeat visits

Saving 2.41g CO2 per returning visitor

617 resources served from cache · 87 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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