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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
81
GRADE
B
FIX
1
REVIEW
3
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 3 REVIEW 1 FIX
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Transfer Efficiency
78% efficient
REVIEW
78% efficient
Info::
Transfer efficiency: 78%
An estimated 187 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 187 KB of unused JavaScript. This wasted data produces 0.05g of unnecessary CO2 per page view.
78% efficient

Total waste: 187 KB (22% of page weight)

Unused JS 187 KB

0.05g unnecessary CO2 per visit

Actual transfer 843 KB
Theoretical minimum 655 KB
Potential savings 187 KB (0.05g 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
0.23g CO2 per view
PASS
0.23g CO2 per view
Info::
0.23g CO2 per page view
This page transfers 0.8 MB, producing an estimated 0.23g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.04g, end-user device 0.15g.
Got: 0.23g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 28.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 28.0 kg of CO2 annually — equivalent to charging 3497 smartphones.

0.23g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 87% of websites

Sustainable Web Design model v4 · Page size: 0.8 MB

Your site
0.23g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.04g
End-user device
0.15g
At 10,000 monthly views: Monthly: 2.3 kg · Annual: 28.0 kg · ≈ 3497 smartphone charges
A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 42 KB (vs 843 KB first visit). 105 of 107 resources are served from browser cache, saving 0.22g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.23g)
First visit
843 KB
Repeat visit
42 KB

95% reduction on repeat visits

Saving 0.22g CO2 per returning visitor

105 resources served from cache · 2 resources re-downloaded

A
Carbon Budget
13th percentile
PASS
13th percentile
Info::
0.23g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 87% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 13th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.23g

13th percentile

Cleaner than 87% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 61% cleaner ✓
vs Target 53% cleaner ✓
Image Optimization
10 images, 7 KB total, 1 KB wasted
INFO

Image Optimization Audit

Total Images

10

Total Size

7 KB

Oversized

5

Wasted

1 KB

2 missing alt text 8 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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