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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
61
GRADE
D
FIX
3
REVIEW
4
PASS
0
INFO
1
Device:
Mobile Desktop
Checks
8
4 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.20g CO2 per view
FIX
1.20g CO2 per view
Warning::
1.20g CO2 per page view
This page transfers 4.2 MB, producing an estimated 1.20g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.22g, network 0.21g, end-user device 0.77g.
Got: 1.20g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 144.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 144.1 kg of CO2 annually — equivalent to charging 18012 smartphones.

1.20g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 33% of websites

Sustainable Web Design model v4 · Page size: 4.2 MB

Your site
1.20g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.22g
Network
0.21g
End-user device
0.77g
At 10,000 monthly views: Monthly: 12.0 kg · Annual: 144.1 kg · ≈ 18012 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::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 AWS✗CDN AWS CloudFront✗

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
67th percentile
FIX
67th percentile
Warning::
1.20g CO2 — above the median website (0.60g)
Heavier than an estimated 33% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 67th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.20g

67th percentile

Cleaner than 33% of websites

✗ Above the median website

vs Median 100% more
vs Target 140% more
B
Repeat Visit Weight
64% cached
REVIEW
64% cached
Info::
64% reduction on repeat visits
Returning visitors download only 1542 KB (vs 4341 KB first visit). 174 of 179 resources are served from browser cache, saving 0.77g CO2 per repeat visit.
Info::
Repeat visit: 0.43g CO2 (first visit: 1.20g)
First visit
4341 KB
Repeat visit
1542 KB

64% reduction on repeat visits

Saving 0.77g CO2 per returning visitor

174 resources served from cache · 5 resources re-downloaded

B
Transfer Efficiency
80% efficient
REVIEW
80% efficient
Info::
Transfer efficiency: 80%
An estimated 868 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 868 KB of unused JavaScript. This wasted data produces 0.24g of unnecessary CO2 per page view.
80% efficient

Total waste: 868 KB (20% of page weight)

Unused JS 868 KB

0.24g unnecessary CO2 per visit

Actual transfer 4341 KB
Theoretical minimum 3473 KB
Potential savings 868 KB (0.24g 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

Image Optimization
200 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

200

Total Size

0 KB

Oversized

11

32 missing alt text 200 missing dimensions 1 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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