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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
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.81g CO2 per view
FIX
1.81g CO2 per view
Warning::
1.81g CO2 per page view
This page transfers 6.4 MB, producing an estimated 1.81g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.34g, network 0.31g, end-user device 1.16g.
Got: 1.81g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 217.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 217.6 kg of CO2 annually — equivalent to charging 27197 smartphones.

1.81g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 16% of websites

Sustainable Web Design model v4 · Page size: 6.4 MB

Your site
1.81g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.34g
Network
0.31g
End-user device
1.16g
At 10,000 monthly views: Monthly: 18.1 kg · Annual: 217.6 kg · ≈ 27197 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

F
Carbon Budget
Action
84th percentile
FIX
84th percentile
Warning::
1.81g CO2 — above the median website (0.60g)
Heavier than an estimated 16% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 84th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.81g

84th percentile

Cleaner than 16% of websites

✗ Above the median website

vs Median 202% more
vs Target 263% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 701 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 701 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
89% efficient

Total waste: 701 KB (11% of page weight)

Unused JS 701 KB

0.19g unnecessary CO2 per visit

Actual transfer 6556 KB
Theoretical minimum 5854 KB
Potential savings 701 KB (0.19g 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 26 KB (vs 6556 KB first visit). 72 of 73 resources are served from browser cache, saving 1.81g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.81g)
First visit
6556 KB
Repeat visit
26 KB

100% reduction on repeat visits

Saving 1.81g CO2 per returning visitor

72 resources served from cache · 1 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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