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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
72
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Transfer Efficiency
Action
49% efficient
FIX
49% efficient
Critical::
Transfer efficiency: 49%
An estimated 386 KB (51%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 386 KB of unused JavaScript. This wasted data produces 0.11g of unnecessary CO2 per page view.
49% efficient

Total waste: 386 KB (51% of page weight)

Unused JS 386 KB

0.11g unnecessary CO2 per visit

Actual transfer 765 KB
Theoretical minimum 378 KB
Potential savings 386 KB (0.11g 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
CO2 Per Page Load
0.21g CO2 per view
PASS
0.21g CO2 per view
Info::
0.21g CO2 per page view
This page transfers 0.7 MB, producing an estimated 0.21g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.04g, end-user device 0.14g.
Got: 0.21g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 25.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 25.4 kg of CO2 annually — equivalent to charging 3175 smartphones.

0.21g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 89% of websites

Sustainable Web Design model v4 · Page size: 0.7 MB

Your site
0.21g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.04g
End-user device
0.14g
At 10,000 monthly views: Monthly: 2.1 kg · Annual: 25.4 kg · ≈ 3175 smartphone charges
A+
Repeat Visit Weight
90% cached
PASS
90% cached
Info::
90% reduction on repeat visits
Returning visitors download only 78 KB (vs 765 KB first visit). 41 of 45 resources are served from browser cache, saving 0.19g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.21g)
First visit
765 KB
Repeat visit
78 KB

90% reduction on repeat visits

Saving 0.19g CO2 per returning visitor

41 resources served from cache · 4 resources re-downloaded

A
Carbon Budget
11th percentile
PASS
11th percentile
Info::
0.21g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 89% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 11th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.21g

11th percentile

Cleaner than 89% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 65% cleaner ✓
vs Target 58% cleaner ✓
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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