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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
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
4.11g CO2 per view
FIX
4.11g CO2 per view
Critical::
4.11g CO2 per page view
This page transfers 14.5 MB, producing an estimated 4.11g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.76g, network 0.71g, end-user device 2.64g.
Got: 4.11g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 493.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 493.7 kg of CO2 annually — equivalent to charging 61713 smartphones.

4.11g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 14.5 MB

Your site
4.11g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.76g
Network
0.71g
End-user device
2.64g
At 10,000 monthly views: Monthly: 41.1 kg · Annual: 493.7 kg · ≈ 61713 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::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 AWS✗CDN AWS CloudFront✗

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
4.11g 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

4.11g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 586% more
vs Target 723% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 628 KB (vs 14876 KB first visit). 108 of 109 resources are served from browser cache, saving 3.94g CO2 per repeat visit.
Info::
Repeat visit: 0.17g CO2 (first visit: 4.11g)
First visit
14876 KB
Repeat visit
628 KB

96% reduction on repeat visits

Saving 3.94g CO2 per returning visitor

108 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
99% efficient
PASS
99% efficient
Info::
Transfer efficiency: 99%
Only 138 KB of potential savings identified. Your page is well-optimized for size.
99% efficient

Total waste: 138 KB (1% of page weight)

Unused JS 138 KB

0.04g unnecessary CO2 per visit

Actual transfer 14876 KB
Theoretical minimum 14737 KB
Potential savings 138 KB (0.04g CO2)

See Deep Analysis sections above for specific optimizations.

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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