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https://welt.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
1
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 1 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

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
0.37g CO2 per view
PASS
0.37g CO2 per view
Info::
0.37g CO2 per page view
This page transfers 1.3 MB, producing an estimated 0.37g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.06g, end-user device 0.24g.
Got: 0.37g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 44.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 44.5 kg of CO2 annually — equivalent to charging 5558 smartphones.

0.37g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 73% of websites

Sustainable Web Design model v4 · Page size: 1.3 MB

Your site
0.37g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.07g
Network
0.06g
End-user device
0.24g
At 10,000 monthly views: Monthly: 3.7 kg · Annual: 44.5 kg · ≈ 5558 smartphone charges
A+
Repeat Visit Weight
87% cached
PASS
87% cached
Info::
87% reduction on repeat visits
Returning visitors download only 171 KB (vs 1339 KB first visit). 98 of 100 resources are served from browser cache, saving 0.32g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 0.37g)
First visit
1339 KB
Repeat visit
171 KB

87% reduction on repeat visits

Saving 0.32g CO2 per returning visitor

98 resources served from cache · 2 resources re-downloaded

A
Carbon Budget
27th percentile
PASS
27th percentile
Info::
0.37g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 73% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 27th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.37g

27th percentile

Cleaner than 73% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 38% cleaner ✓
vs Target 26% cleaner ✓
A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 101 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 101 KB (8% of page weight)

Unused JS 101 KB

0.03g unnecessary CO2 per visit

Actual transfer 1339 KB
Theoretical minimum 1238 KB
Potential savings 101 KB (0.03g 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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