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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
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
6.92g CO2 per view
FIX
6.92g CO2 per view
Critical::
6.92g CO2 per page view
This page transfers 24.4 MB, producing an estimated 6.92g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 1.28g, network 1.20g, end-user device 4.44g.
Got: 6.92g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 830.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 830.3 kg of CO2 annually — equivalent to charging 103787 smartphones.

6.92g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 24.4 MB

Your site
6.92g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
1.28g
Network
1.20g
End-user device
4.44g
At 10,000 monthly views: Monthly: 69.2 kg · Annual: 830.3 kg · ≈ 103787 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 Snowplow Analytics✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
6.92g 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

6.92g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 1053% more
vs Target 1284% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 2808 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2808 KB of unused JavaScript. This wasted data produces 0.78g of unnecessary CO2 per page view.
89% efficient

Total waste: 2808 KB (11% of page weight)

Unused JS 2808 KB

0.78g unnecessary CO2 per visit

Actual transfer 25018 KB
Theoretical minimum 22210 KB
Potential savings 2808 KB (0.78g 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 435 KB (vs 25018 KB first visit). 1007 of 1073 resources are served from browser cache, saving 6.80g CO2 per repeat visit.
Info::
Repeat visit: 0.12g CO2 (first visit: 6.92g)
First visit
25018 KB
Repeat visit
435 KB

98% reduction on repeat visits

Saving 6.80g CO2 per returning visitor

1007 resources served from cache · 66 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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