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https://uni-bielefeld.de

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
84
GRADE
B
FIX
1
REVIEW
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 2 REVIEW 1 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

B
Carbon Budget
31th percentile
REVIEW
31th percentile
Info::
0.41g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 69% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 31th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.41g

31st percentile

Cleaner than 69% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 31% cleaner ✓
vs Target 17% cleaner ✓
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
0.41g CO2 per view
PASS
0.41g CO2 per view
Info::
0.41g CO2 per page view
This page transfers 1.5 MB, producing an estimated 0.41g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.07g, end-user device 0.27g.
Got: 0.41g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 49.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 49.6 kg of CO2 annually — equivalent to charging 6197 smartphones.

0.41g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 69% of websites

Sustainable Web Design model v4 · Page size: 1.5 MB

Your site
0.41g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.08g
Network
0.07g
End-user device
0.27g
At 10,000 monthly views: Monthly: 4.1 kg · Annual: 49.6 kg · ≈ 6197 smartphone charges
A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 30 KB (vs 1493 KB first visit). 34 of 35 resources are served from browser cache, saving 0.40g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.41g)
First visit
1493 KB
Repeat visit
30 KB

98% reduction on repeat visits

Saving 0.40g CO2 per returning visitor

34 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 80 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 80 KB (5% of page weight)

Unused JS 80 KB

0.02g unnecessary CO2 per visit

Actual transfer 1493 KB
Theoretical minimum 1413 KB
Potential savings 80 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

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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