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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
72
GRADE
C
FIX
2
REVIEW
3
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 3 REVIEW 2 FIX
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::
Akamai: Committed to 50% renewable by 2030
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 Akamai✗

Akamai: Committed to 50% renewable by 2030

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
51th percentile
FIX
51th percentile
Warning::
0.66g CO2 — above the median website (0.60g)
Heavier than an estimated 49% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 51th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.66g

51st percentile

Cleaner than 49% of websites

✗ Above the median website

vs Median 10% more
vs Target 31% more
B
CO2 Per Page Load
0.66g CO2 per view
REVIEW
0.66g CO2 per view
Info::
0.66g CO2 per page view
This page transfers 2.3 MB, producing an estimated 0.66g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.11g, end-user device 0.42g.
Got: 0.66g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 78.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 78.9 kg of CO2 annually — equivalent to charging 9857 smartphones.

0.66g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 49% of websites

Sustainable Web Design model v4 · Page size: 2.3 MB

Your site
0.66g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.12g
Network
0.11g
End-user device
0.42g
At 10,000 monthly views: Monthly: 6.6 kg · Annual: 78.9 kg · ≈ 9857 smartphone charges
B
Transfer Efficiency
86% efficient
REVIEW
86% efficient
Info::
Transfer efficiency: 86%
An estimated 341 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 341 KB of unused JavaScript. This wasted data produces 0.09g of unnecessary CO2 per page view.
86% efficient

Total waste: 341 KB (14% of page weight)

Unused JS 341 KB

0.09g unnecessary CO2 per visit

Actual transfer 2376 KB
Theoretical minimum 2034 KB
Potential savings 341 KB (0.09g 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
87% cached
PASS
87% cached
Info::
87% reduction on repeat visits
Returning visitors download only 315 KB (vs 2376 KB first visit). 76 of 78 resources are served from browser cache, saving 0.57g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 0.66g)
First visit
2376 KB
Repeat visit
315 KB

87% reduction on repeat visits

Saving 0.57g CO2 per returning visitor

76 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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