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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
76
GRADE
C
FIX
1
REVIEW
4
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 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
Carbon Budget
31th percentile
REVIEW
31th percentile
Info::
0.41g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 69% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 31th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.41g

31st percentile

Cleaner than 69% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 31% cleaner ✓
vs Target 18% cleaner ✓
C
Transfer Efficiency
Action
72% efficient
REVIEW
72% efficient
Warning::
Transfer efficiency: 72%
An estimated 415 KB (28%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 415 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.
72% efficient

Total waste: 415 KB (28% of page weight)

Unused JS 415 KB

0.12g unnecessary CO2 per visit

Actual transfer 1488 KB
Theoretical minimum 1072 KB
Potential savings 415 KB (0.12g CO2)

See Deep Analysis sections above for specific optimizations.

B
Web Font Weight Variants
No detectable Google Fonts weights
REVIEW
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
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
0.41g CO2 per view
PASS
0.41g CO2 per view
Info::
0.41g CO2 per page view
This page transfers 1.5 MB, producing an estimated 0.41g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.07g, end-user device 0.26g.
Got: 0.41g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 49.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 49.4 kg of CO2 annually — equivalent to charging 6174 smartphones.

0.41g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 69% of websites

Sustainable Web Design model v4 · Page size: 1.5 MB

Your site
0.41g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.08g
Network
0.07g
End-user device
0.26g
At 10,000 monthly views: Monthly: 4.1 kg · Annual: 49.4 kg · ≈ 6174 smartphone charges
A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 27 KB (vs 1488 KB first visit). 64 of 65 resources are served from browser cache, saving 0.40g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.41g)
First visit
1488 KB
Repeat visit
27 KB

98% reduction on repeat visits

Saving 0.40g CO2 per returning visitor

64 resources served from cache · 1 resources re-downloaded

Image Optimization
2 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

2

Total Size

0 KB

2 missing dimensions 2 missing lazy loading
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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