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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
60
GRADE
D
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.22g CO2 per view
FIX
1.22g CO2 per view
Warning::
1.22g CO2 per page view
This page transfers 4.3 MB, producing an estimated 1.22g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.23g, network 0.21g, end-user device 0.79g.
Got: 1.22g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 146.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 146.9 kg of CO2 annually — equivalent to charging 18367 smartphones.

1.22g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 33% of websites

Sustainable Web Design model v4 · Page size: 4.3 MB

Your site
1.22g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.23g
Network
0.21g
End-user device
0.79g
At 10,000 monthly views: Monthly: 12.2 kg · Annual: 146.9 kg · ≈ 18367 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 Microsoft IIS✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
67th percentile
FIX
67th percentile
Warning::
1.22g 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

1.22g

67th percentile

Cleaner than 33% of websites

✗ Above the median website

vs Median 104% more
vs Target 145% more
C
Transfer Efficiency
Action
70% efficient
REVIEW
70% efficient
Warning::
Transfer efficiency: 70%
An estimated 1312 KB (30%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1312 KB of unused JavaScript. This wasted data produces 0.36g of unnecessary CO2 per page view.
70% efficient

Total waste: 1312 KB (30% of page weight)

Unused JS 1312 KB

0.36g unnecessary CO2 per visit

Actual transfer 4427 KB
Theoretical minimum 3115 KB
Potential savings 1312 KB (0.36g 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 21 KB (vs 4427 KB first visit). 150 of 154 resources are served from browser cache, saving 1.22g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.22g)
First visit
4427 KB
Repeat visit
21 KB

100% reduction on repeat visits

Saving 1.22g CO2 per returning visitor

150 resources served from cache · 4 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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