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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
58
GRADE
D
FIX
3
REVIEW
4
PASS
0
INFO
1
Device:
Mobile Desktop
Checks
8
4 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.53g CO2 per view
FIX
1.53g CO2 per view
Warning::
1.53g CO2 per page view
This page transfers 5.4 MB, producing an estimated 1.53g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.28g, network 0.27g, end-user device 0.98g.
Got: 1.53g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 184.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 184.1 kg of CO2 annually — equivalent to charging 23006 smartphones.

1.53g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 24% of websites

Sustainable Web Design model v4 · Page size: 5.4 MB

Your site
1.53g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.28g
Network
0.27g
End-user device
0.98g
At 10,000 monthly views: Monthly: 15.3 kg · Annual: 184.1 kg · ≈ 23006 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

F
Carbon Budget
Action
76th percentile
FIX
76th percentile
Warning::
1.53g CO2 — above the median website (0.60g)
Heavier than an estimated 24% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 76th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.53g

76th percentile

Cleaner than 24% of websites

✗ Above the median website

vs Median 156% more
vs Target 207% more
B
Repeat Visit Weight
78% cached
REVIEW
78% cached
Info::
78% reduction on repeat visits
Returning visitors download only 1212 KB (vs 5545 KB first visit). 187 of 192 resources are served from browser cache, saving 1.20g CO2 per repeat visit.
Info::
Repeat visit: 0.34g CO2 (first visit: 1.53g)
First visit
5545 KB
Repeat visit
1212 KB

78% reduction on repeat visits

Saving 1.20g CO2 per returning visitor

187 resources served from cache · 5 resources re-downloaded

B
Transfer Efficiency
85% efficient
REVIEW
85% efficient
Info::
Transfer efficiency: 85%
An estimated 841 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 841 KB of unused JavaScript. This wasted data produces 0.23g of unnecessary CO2 per page view.
85% efficient

Total waste: 841 KB (15% of page weight)

Unused JS 841 KB

0.23g unnecessary CO2 per visit

Actual transfer 5545 KB
Theoretical minimum 4704 KB
Potential savings 841 KB (0.23g 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

13

29 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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