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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
68
GRADE
D
FIX
1
REVIEW
4
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 4 REVIEW 1 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::
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

B
CO2 Per Page Load
0.53g CO2 per view
REVIEW
0.53g CO2 per view
Info::
0.53g CO2 per page view
This page transfers 1.9 MB, producing an estimated 0.53g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.09g, end-user device 0.34g.
Got: 0.53g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 63.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 63.5 kg of CO2 annually — equivalent to charging 7941 smartphones.

0.53g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 58% of websites

Sustainable Web Design model v4 · Page size: 1.9 MB

Your site
0.53g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.10g
Network
0.09g
End-user device
0.34g
At 10,000 monthly views: Monthly: 5.3 kg · Annual: 63.5 kg · ≈ 7941 smartphone charges
B
Carbon Budget
42th percentile
REVIEW
42th percentile
Info::
0.53g CO2 — below the median website (0.60g)
Better than an estimated 58% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 42th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.53g

42nd percentile

Cleaner than 58% of websites

✗ Above the median website

vs Median 12% cleaner ✓
vs Target 6% more
C
Transfer Efficiency
Action
75% efficient
REVIEW
75% efficient
Warning::
Transfer efficiency: 75%
An estimated 482 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 482 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.
75% efficient

Total waste: 482 KB (25% of page weight)

Unused JS 482 KB

0.13g unnecessary CO2 per visit

Actual transfer 1914 KB
Theoretical minimum 1432 KB
Potential savings 482 KB (0.13g 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
93% cached
PASS
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 129 KB (vs 1914 KB first visit). 90 of 91 resources are served from browser cache, saving 0.49g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.53g)
First visit
1914 KB
Repeat visit
129 KB

93% reduction on repeat visits

Saving 0.49g CO2 per returning visitor

90 resources served from cache · 1 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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