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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
54
GRADE
F
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
38.54g CO2 per view
FIX
38.54g CO2 per view
Critical::
38.54g CO2 per page view
This page transfers 136.1 MB, producing an estimated 38.54g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 7.14g, network 6.66g, end-user device 24.74g.
Got: 38.54g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 4624.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 4624.5 kg of CO2 annually — equivalent to charging 578061 smartphones.

38.54g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 136.1 MB

Your site
38.54g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
7.14g
Network
6.66g
End-user device
24.74g
At 10,000 monthly views: Monthly: 385.4 kg · Annual: 4624.5 kg · ≈ 578061 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 Apache Traffic Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
38.54g 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

38.54g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 6323% more
vs Target 7607% more
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 83 KB (vs 139344 KB first visit). 205 of 219 resources are served from browser cache, saving 38.51g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 38.54g)
First visit
139344 KB
Repeat visit
83 KB

100% reduction on repeat visits

Saving 38.51g CO2 per returning visitor

205 resources served from cache · 14 resources re-downloaded

A+
Transfer Efficiency
99% efficient
PASS
99% efficient
Info::
Transfer efficiency: 99%
Only 816 KB of potential savings identified. Your page is well-optimized for size.
99% efficient

Total waste: 816 KB (1% of page weight)

Unused JS 816 KB

0.23g unnecessary CO2 per visit

Actual transfer 139344 KB
Theoretical minimum 138528 KB
Potential savings 816 KB (0.23g CO2)

See Deep Analysis sections above for specific optimizations.

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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