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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
80
GRADE
B
FIX
1
REVIEW
2
PASS
4
INFO
1
Device:
Mobile Desktop
Checks
8
4 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::
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

B
Carbon Budget
37th percentile
REVIEW
37th percentile
Info::
0.48g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 63% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 37th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.48g

37th percentile

Cleaner than 63% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 20% cleaner ✓
vs Target 5% cleaner ✓
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
0.48g CO2 per view
PASS
0.48g CO2 per view
Info::
0.48g CO2 per page view
This page transfers 1.7 MB, producing an estimated 0.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.08g, end-user device 0.31g.
Got: 0.48g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 57.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 57.3 kg of CO2 annually — equivalent to charging 7159 smartphones.

0.48g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 63% of websites

Sustainable Web Design model v4 · Page size: 1.7 MB

Your site
0.48g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.09g
Network
0.08g
End-user device
0.31g
At 10,000 monthly views: Monthly: 4.8 kg · Annual: 57.3 kg · ≈ 7159 smartphone charges
A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 9 KB (vs 1725 KB first visit). 62 of 63 resources are served from browser cache, saving 0.47g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.48g)
First visit
1725 KB
Repeat visit
9 KB

99% reduction on repeat visits

Saving 0.47g CO2 per returning visitor

62 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 43 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 43 KB (3% of page weight)

Unused JS 43 KB

0.01g unnecessary CO2 per visit

Actual transfer 1725 KB
Theoretical minimum 1682 KB
Potential savings 43 KB (0.01g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Web Font Weight Variants
2 font weights loaded across 1 famil(y/ies) -- reasonable
PASS
2 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
2 font weight(s) loaded across 1 famil(y/ies)
Image Optimization
2 images, 55 KB total, 47 KB wasted
INFO

Image Optimization Audit

Total Images

2

Total Size

55 KB

Oversized

1

Wasted

47 KB

2 missing dimensions
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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