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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
0.98g CO2 per view
FIX
0.98g CO2 per view
Info::
0.98g CO2 per page view
This page transfers 3.5 MB, producing an estimated 0.98g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.18g, network 0.17g, end-user device 0.63g.
Got: 0.98g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 118.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 118.0 kg of CO2 annually — equivalent to charging 14754 smartphones.

0.98g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 40% of websites

Sustainable Web Design model v4 · Page size: 3.5 MB

Your site
0.98g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.18g
Network
0.17g
End-user device
0.63g
At 10,000 monthly views: Monthly: 9.8 kg · Annual: 118.0 kg · ≈ 14754 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

D
Carbon Budget
Action
60th percentile
FIX
60th percentile
Warning::
0.98g CO2 — above the median website (0.60g)
Heavier than an estimated 40% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 60th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.98g

60th percentile

Cleaner than 40% of websites

✗ Above the median website

vs Median 64% more
vs Target 97% more
B
Transfer Efficiency
77% efficient
REVIEW
77% efficient
Info::
Transfer efficiency: 77%
An estimated 812 KB (23%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 812 KB of unused JavaScript. This wasted data produces 0.22g of unnecessary CO2 per page view.
77% efficient

Total waste: 812 KB (23% of page weight)

Unused JS 812 KB

0.22g unnecessary CO2 per visit

Actual transfer 3556 KB
Theoretical minimum 2743 KB
Potential savings 812 KB (0.22g 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 62 KB (vs 3556 KB first visit). 172 of 176 resources are served from browser cache, saving 0.97g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.98g)
First visit
3556 KB
Repeat visit
62 KB

98% reduction on repeat visits

Saving 0.97g CO2 per returning visitor

172 resources served from cache · 4 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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