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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
53
GRADE
F
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
2.37g CO2 per view
FIX
2.37g CO2 per view
Critical::
2.37g CO2 per page view
This page transfers 8.4 MB, producing an estimated 2.37g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.44g, network 0.41g, end-user device 1.52g.
Got: 2.37g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 284.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 284.5 kg of CO2 annually — equivalent to charging 35566 smartphones.

2.37g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.4 MB

Your site
2.37g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.44g
Network
0.41g
End-user device
1.52g
At 10,000 monthly views: Monthly: 23.7 kg · Annual: 284.5 kg · ≈ 35566 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
95th percentile
FIX
95th percentile
Warning::
2.37g 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

2.37g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 295% more
vs Target 374% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 946 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 946 KB of unused JavaScript. This wasted data produces 0.26g of unnecessary CO2 per page view.
89% efficient

Total waste: 946 KB (11% of page weight)

Unused JS 946 KB

0.26g unnecessary CO2 per visit

Actual transfer 8573 KB
Theoretical minimum 7626 KB
Potential savings 946 KB (0.26g 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 15 KB (vs 8573 KB first visit). 67 of 69 resources are served from browser cache, saving 2.37g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 2.37g)
First visit
8573 KB
Repeat visit
15 KB

100% reduction on repeat visits

Saving 2.37g CO2 per returning visitor

67 resources served from cache · 2 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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