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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
60
GRADE
D
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.47g CO2 per view
FIX
1.47g CO2 per view
Warning::
1.47g CO2 per page view
This page transfers 5.2 MB, producing an estimated 1.47g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 0.25g, end-user device 0.94g.
Got: 1.47g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 176.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 176.2 kg of CO2 annually — equivalent to charging 22019 smartphones.

1.47g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 26% of websites

Sustainable Web Design model v4 · Page size: 5.2 MB

Your site
1.47g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.27g
Network
0.25g
End-user device
0.94g
At 10,000 monthly views: Monthly: 14.7 kg · Annual: 176.2 kg · ≈ 22019 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 HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
74th percentile
FIX
74th percentile
Warning::
1.47g CO2 — above the median website (0.60g)
Heavier than an estimated 26% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 74th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.47g

74th percentile

Cleaner than 26% of websites

✗ Above the median website

vs Median 145% more
vs Target 194% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 559 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 559 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
89% efficient

Total waste: 559 KB (11% of page weight)

Unused JS 559 KB

0.15g unnecessary CO2 per visit

Actual transfer 5307 KB
Theoretical minimum 4748 KB
Potential savings 559 KB (0.15g 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 16 KB (vs 5307 KB first visit). 89 of 91 resources are served from browser cache, saving 1.46g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.47g)
First visit
5307 KB
Repeat visit
16 KB

100% reduction on repeat visits

Saving 1.46g CO2 per returning visitor

89 resources served from cache · 2 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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