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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
64
GRADE
D
FIX
2
REVIEW
3
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 3 REVIEW 2 FIX
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 Snowplow Analytics✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
53th percentile
FIX
53th percentile
Warning::
0.71g CO2 — above the median website (0.60g)
Heavier than an estimated 47% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 53th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.71g

53rd percentile

Cleaner than 47% of websites

✗ Above the median website

vs Median 19% more
vs Target 42% more
B
CO2 Per Page Load
0.71g CO2 per view
REVIEW
0.71g CO2 per view
Info::
0.71g CO2 per page view
This page transfers 2.5 MB, producing an estimated 0.71g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.13g, network 0.12g, end-user device 0.46g.
Got: 0.71g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 85.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 85.4 kg of CO2 annually — equivalent to charging 10679 smartphones.

0.71g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 47% of websites

Sustainable Web Design model v4 · Page size: 2.5 MB

Your site
0.71g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.13g
Network
0.12g
End-user device
0.46g
At 10,000 monthly views: Monthly: 7.1 kg · Annual: 85.4 kg · ≈ 10679 smartphone charges
C
Transfer Efficiency
Action
60% efficient
REVIEW
60% efficient
Warning::
Transfer efficiency: 60%
An estimated 1017 KB (40%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1017 KB of unused JavaScript. This wasted data produces 0.28g of unnecessary CO2 per page view.
60% efficient

Total waste: 1017 KB (40% of page weight)

Unused JS 1017 KB

0.28g unnecessary CO2 per visit

Actual transfer 2574 KB
Theoretical minimum 1556 KB
Potential savings 1017 KB (0.28g 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 85 KB (vs 2574 KB first visit). 117 of 120 resources are served from browser cache, saving 0.69g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.71g)
First visit
2574 KB
Repeat visit
85 KB

97% reduction on repeat visits

Saving 0.69g CO2 per returning visitor

117 resources served from cache · 3 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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