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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
56
GRADE
D
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.90g CO2 per view
FIX
1.90g CO2 per view
Warning::
1.90g CO2 per page view
This page transfers 6.7 MB, producing an estimated 1.90g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.35g, network 0.33g, end-user device 1.22g.
Got: 1.90g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 227.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 227.5 kg of CO2 annually — equivalent to charging 28436 smartphones.

1.90g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 13% of websites

Sustainable Web Design model v4 · Page size: 6.7 MB

Your site
1.90g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.35g
Network
0.33g
End-user device
1.22g
At 10,000 monthly views: Monthly: 19.0 kg · Annual: 227.5 kg · ≈ 28436 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
87th percentile
FIX
87th percentile
Warning::
1.90g CO2 — above the median website (0.60g)
Heavier than an estimated 13% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 87th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.90g

87th percentile

Cleaner than 13% of websites

✗ Above the median website

vs Median 216% more
vs Target 279% more
B
Transfer Efficiency
88% efficient
REVIEW
88% efficient
Info::
Transfer efficiency: 88%
An estimated 823 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 823 KB of unused JavaScript. This wasted data produces 0.23g of unnecessary CO2 per page view.
88% efficient

Total waste: 823 KB (12% of page weight)

Unused JS 823 KB

0.23g unnecessary CO2 per visit

Actual transfer 6854 KB
Theoretical minimum 6031 KB
Potential savings 823 KB (0.23g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 60 KB (vs 6854 KB first visit). 213 of 220 resources are served from browser cache, saving 1.88g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.90g)
First visit
6854 KB
Repeat visit
60 KB

99% reduction on repeat visits

Saving 1.88g CO2 per returning visitor

213 resources served from cache · 7 resources re-downloaded

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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