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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
50
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
3.96g CO2 per view
FIX
3.96g CO2 per view
Critical::
3.96g CO2 per page view
This page transfers 14.0 MB, producing an estimated 3.96g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.73g, network 0.68g, end-user device 2.54g.
Got: 3.96g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 475.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 475.1 kg of CO2 annually — equivalent to charging 59392 smartphones.

3.96g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 14.0 MB

Your site
3.96g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.73g
Network
0.68g
End-user device
2.54g
At 10,000 monthly views: Monthly: 39.6 kg · Annual: 475.1 kg · ≈ 59392 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::
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

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.96g 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

3.96g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 560% more
vs Target 692% more
B
Transfer Efficiency
87% efficient
REVIEW
87% efficient
Info::
Transfer efficiency: 87%
An estimated 1848 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1848 KB of unused JavaScript. This wasted data produces 0.51g of unnecessary CO2 per page view.
87% efficient

Total waste: 1848 KB (13% of page weight)

Unused JS 1848 KB

0.51g unnecessary CO2 per visit

Actual transfer 14316 KB
Theoretical minimum 12468 KB
Potential savings 1848 KB (0.51g 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 43 KB (vs 14316 KB first visit). 202 of 204 resources are served from browser cache, saving 3.95g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 3.96g)
First visit
14316 KB
Repeat visit
43 KB

100% reduction on repeat visits

Saving 3.95g CO2 per returning visitor

202 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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