https://www.der-betze-brennt.de
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
78
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
DCO2 Per Page LoadAction1.00g CO2 per viewFIX
CO2 Per Page Load
Action1.00g CO2 per view
1.00g CO2 per view
Info::
1.00g CO2 per page view
This page transfers 4.2 MB, producing an estimated 1.00g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.21g, end-user device 0.77g.
Got: 1.00g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 119.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 119.9 kg of CO2 annually — equivalent to charging 14983 smartphones.
Info::
Green hosting reduces data center emissions
1.00g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 39% of websites
Sustainable Web Design model v4 · Page size: 4.2 MB
Your site
1.00g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.21g
End-user device
0.77g
At 10,000 monthly views: Monthly: 10.0 kg · Annual: 119.9 kg · ≈ 14983 smartphone charges
DCarbon BudgetAction61th percentileFIX
Carbon Budget
Action61th percentile
61th percentile
Warning::
1.00g CO2 — above the median website (0.60g)
Heavier than an estimated 39% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 61th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.00g
61st percentile
Cleaner than 39% of websites
✗ Above the median website
vs Median 66% more
vs Target 100% more
BTransfer Efficiency85% efficientREVIEW
Transfer Efficiency
85% efficient
85% efficient
Info::
Transfer efficiency: 85%
An estimated 649 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 649 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
Total waste: 649 KB (15% of page weight)
Unused JS 649 KB
0.15g unnecessary CO2 per visit
Actual transfer 4321 KB
Theoretical minimum 3672 KB
Potential savings 649 KB (0.15g CO2)
See Deep Analysis sections above for specific optimizations.
BWeb Font Weight VariantsNo detectable Google Fonts weightsREVIEW
Web Font Weight Variants
No detectable Google Fonts weights
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: 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 Cloudflare✓CDN Cloudflare✓
Cloudflare: 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 Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 15 KB (vs 4321 KB first visit). 61 of 63 resources are served from browser cache, saving 1.00g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.00g)
First visit
4321 KB
Repeat visit
15 KB
100% reduction on repeat visits
Saving 1.00g CO2 per returning visitor
61 resources served from cache · 2 resources re-downloaded
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
Image Optimization74 images, 1366 KB total, 750 KB wastedINFO
Image Optimization
74 images, 1366 KB total, 750 KB wasted
Image Optimization Audit
Total Images
74
Total Size
1366 KB
Oversized
17
Wasted
750 KB
29 missing alt text 22 missing dimensions 39 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.