https://berliner-zeitung.de
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
80
GRADE
B
FIX
2
REVIEW
0
PASS
4
INFO
0
Checks
64 PASS 2 FIX
DCO2 Per Page LoadAction1.33g CO2 per viewFIX
CO2 Per Page Load
Action1.33g CO2 per view
1.33g CO2 per view
Warning::
1.33g CO2 per page view
This page transfers 5.6 MB, producing an estimated 1.33g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.28g, end-user device 1.02g.
Got: 1.33g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 159.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 159.9 kg of CO2 annually — equivalent to charging 19988 smartphones.
Info::
Green hosting reduces data center emissions
1.33g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 30% of websites
Sustainable Web Design model v4 · Page size: 5.6 MB
Your site
1.33g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.28g
End-user device
1.02g
At 10,000 monthly views: Monthly: 13.3 kg · Annual: 159.9 kg · ≈ 19988 smartphone charges
DCarbon BudgetAction70th percentileFIX
Carbon Budget
Action70th percentile
70th percentile
Warning::
1.33g CO2 — above the median website (0.60g)
Heavier than an estimated 30% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 70th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.33g
70th percentile
Cleaner than 30% of websites
✗ Above the median website
vs Median 122% more
vs Target 167% more
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Cloudflare
Info::
Next.js: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Hosting✓ Green Hosted
Hosting Next.js✓CDN Cloudflare✓
Next.js: Verified by the Green Web Foundation
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight96% cachedPASS
Repeat Visit Weight
96% cached
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 228 KB (vs 5765 KB first visit). 201 of 206 resources are served from browser cache, saving 1.28g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 1.33g)
First visit
5765 KB
Repeat visit
228 KB
96% reduction on repeat visits
Saving 1.28g CO2 per returning visitor
201 resources served from cache · 5 resources re-downloaded
A+Transfer Efficiency94% efficientPASS
Transfer Efficiency
94% efficient
94% efficient
Info::
Transfer efficiency: 94%
Only 355 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 355 KB (6% of page weight)
Unused JS 355 KB
0.08g unnecessary CO2 per visit
Actual transfer 5765 KB
Theoretical minimum 5409 KB
Potential savings 355 KB (0.08g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.