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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
78
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::
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
CO2 Per Page Load
0.63g CO2 per view
REVIEW
0.63g CO2 per view
Info::
0.63g CO2 per page view
This page transfers 2.2 MB, producing an estimated 0.63g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.11g, end-user device 0.41g.
Got: 0.63g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 75.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 75.9 kg of CO2 annually — equivalent to charging 9486 smartphones.

0.63g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 50% of websites

Sustainable Web Design model v4 · Page size: 2.2 MB

Your site
0.63g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.12g
Network
0.11g
End-user device
0.41g
At 10,000 monthly views: Monthly: 6.3 kg · Annual: 75.9 kg · ≈ 9486 smartphone charges
B
Carbon Budget
50th percentile
REVIEW
50th percentile
Warning::
0.63g CO2 — above the median website (0.60g)
Heavier than an estimated 50% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 50th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.63g

50th percentile

Cleaner than 50% of websites

✗ Above the median website

vs Median 5% more
vs Target 26% more
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+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 54 KB (vs 2286 KB first visit). 106 of 108 resources are served from browser cache, saving 0.62g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.63g)
First visit
2286 KB
Repeat visit
54 KB

98% reduction on repeat visits

Saving 0.62g CO2 per returning visitor

106 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 131 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 131 KB (6% of page weight)

Unused JS 131 KB

0.04g unnecessary CO2 per visit

Actual transfer 2286 KB
Theoretical minimum 2155 KB
Potential savings 131 KB (0.04g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
129 images, 249 KB total, 38 KB wasted
INFO

Image Optimization Audit

Total Images

129

Total Size

249 KB

Oversized

9

Wasted

38 KB

16 missing alt text 31 missing dimensions 106 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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