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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
74
GRADE
C
FIX
1
REVIEW
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 2 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

C
Transfer Efficiency
Action
74% efficient
REVIEW
74% efficient
Warning::
Transfer efficiency: 74%
An estimated 310 KB (26%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 310 KB of unused JavaScript. This wasted data produces 0.09g of unnecessary CO2 per page view.
74% efficient

Total waste: 310 KB (26% of page weight)

Unused JS 310 KB

0.09g unnecessary CO2 per visit

Actual transfer 1175 KB
Theoretical minimum 865 KB
Potential savings 310 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
CO2 Per Page Load
0.33g CO2 per view
PASS
0.33g CO2 per view
Info::
0.33g CO2 per page view
This page transfers 1.1 MB, producing an estimated 0.33g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.06g, end-user device 0.21g.
Got: 0.33g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 39.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 39.0 kg of CO2 annually — equivalent to charging 4878 smartphones.

0.33g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 78% of websites

Sustainable Web Design model v4 · Page size: 1.1 MB

Your site
0.33g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.06g
Network
0.06g
End-user device
0.21g
At 10,000 monthly views: Monthly: 3.3 kg · Annual: 39.0 kg · ≈ 4878 smartphone charges
A+
Repeat Visit Weight
93% cached
PASS
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 81 KB (vs 1175 KB first visit). 36 of 37 resources are served from browser cache, saving 0.30g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.33g)
First visit
1175 KB
Repeat visit
81 KB

93% reduction on repeat visits

Saving 0.30g CO2 per returning visitor

36 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
22th percentile
PASS
22th percentile
Info::
0.33g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 78% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 22th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.33g

22nd percentile

Cleaner than 78% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 46% cleaner ✓
vs Target 35% cleaner ✓
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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