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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
3
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 3 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::
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 Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

C
Transfer Efficiency
Action
68% efficient
REVIEW
68% efficient
Warning::
Transfer efficiency: 68%
An estimated 304 KB (32%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 304 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.
68% efficient

Total waste: 304 KB (32% of page weight)

Unused JS 304 KB

0.08g unnecessary CO2 per visit

Actual transfer 959 KB
Theoretical minimum 655 KB
Potential savings 304 KB (0.08g CO2)

See Deep Analysis sections above for specific optimizations.

C
Web Font Weight Variants
Action
9 font weights loaded across 2 famil(y/ies)
REVIEW
9 font weights loaded across 2 famil(y/ies)
Warning::
9 font weights loaded -- likely 100+ KB of unused payload
Loading 9 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Open Sans, Raleway.
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
0.27g CO2 per view
PASS
0.27g CO2 per view
Info::
0.27g CO2 per page view
This page transfers 0.9 MB, producing an estimated 0.27g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.05g, end-user device 0.17g.
Got: 0.27g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 31.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 31.8 kg of CO2 annually — equivalent to charging 3980 smartphones.

0.27g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 84% of websites

Sustainable Web Design model v4 · Page size: 0.9 MB

Your site
0.27g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.05g
End-user device
0.17g
At 10,000 monthly views: Monthly: 2.7 kg · Annual: 31.8 kg · ≈ 3980 smartphone charges
A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 22 KB (vs 959 KB first visit). 31 of 32 resources are served from browser cache, saving 0.26g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.27g)
First visit
959 KB
Repeat visit
22 KB

98% reduction on repeat visits

Saving 0.26g CO2 per returning visitor

31 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
16th percentile
PASS
16th percentile
Info::
0.27g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 84% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 16th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.27g

16th percentile

Cleaner than 84% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 56% cleaner ✓
vs Target 47% cleaner ✓
Image Optimization
6 images, 41 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

6

Total Size

41 KB

4 missing dimensions 3 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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