https://taz.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
Checks
63 PASS 2 REVIEW 1 FIX
DGreen HostingActionUnknownFIX
Green Hosting
ActionUnknown
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
BCarbon Budget35th percentileREVIEW
Carbon Budget
35th percentile
35th percentile
Info::
0.46g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 65% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 35th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.46g
35th percentile
Cleaner than 65% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 24% cleaner ✓
vs Target 9% cleaner ✓
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
ACO2 Per Page Load0.46g CO2 per viewPASS
CO2 Per Page Load
0.46g CO2 per view
0.46g CO2 per view
Info::
0.46g CO2 per page view
This page transfers 1.6 MB, producing an estimated 0.46g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.08g, end-user device 0.29g.
Got: 0.46g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 54.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 54.8 kg of CO2 annually — equivalent to charging 6844 smartphones.
0.46g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 65% of websites
Sustainable Web Design model v4 · Page size: 1.6 MB
Your site
0.46g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.08g
Network
0.08g
End-user device
0.29g
At 10,000 monthly views: Monthly: 4.6 kg · Annual: 54.8 kg · ≈ 6844 smartphone charges
A+Repeat Visit Weight95% cachedPASS
Repeat Visit Weight
95% cached
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 78 KB (vs 1649 KB first visit). 108 of 111 resources are served from browser cache, saving 0.43g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.46g)
First visit
1649 KB
Repeat visit
78 KB
95% reduction on repeat visits
Saving 0.43g CO2 per returning visitor
108 resources served from cache · 3 resources re-downloaded
A+Transfer Efficiency92% efficientPASS
Transfer Efficiency
92% efficient
92% efficient
Info::
Transfer efficiency: 92%
Only 129 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 129 KB (8% of page weight)
Unused JS 129 KB
0.04g unnecessary CO2 per visit
Actual transfer 1649 KB
Theoretical minimum 1520 KB
Potential savings 129 KB (0.04g 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.