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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
62
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.90g CO2 per view
FIX
2.90g CO2 per view
Critical::
2.90g CO2 per page view
This page transfers 10.2 MB, producing an estimated 2.90g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.54g, network 0.50g, end-user device 1.86g.
Got: 2.90g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 348.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 348.1 kg of CO2 annually — equivalent to charging 43516 smartphones.

2.90g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 10.2 MB

Your site
2.90g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.54g
Network
0.50g
End-user device
1.86g
At 10,000 monthly views: Monthly: 29.0 kg · Annual: 348.1 kg · ≈ 43516 smartphone charges
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

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.90g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.90g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 384% more
vs Target 480% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 31 KB (vs 10489 KB first visit). 62 of 63 resources are served from browser cache, saving 2.89g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.90g)
First visit
10489 KB
Repeat visit
31 KB

100% reduction on repeat visits

Saving 2.89g CO2 per returning visitor

62 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
99% efficient
PASS
99% efficient
Info::
Transfer efficiency: 99%
Only 70 KB of potential savings identified. Your page is well-optimized for size.
99% efficient

Total waste: 70 KB (1% of page weight)

Unused JS 70 KB

0.02g unnecessary CO2 per visit

Actual transfer 10489 KB
Theoretical minimum 10418 KB
Potential savings 70 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
57 images, 10282 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

57

Total Size

10282 KB

56 missing alt text 57 missing dimensions 56 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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