https://public.lu
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
88
GRADE
B
FIX
1
REVIEW
1
PASS
4
INFO
0
Checks
64 PASS 1 REVIEW 1 FIX
DGreen HostingActionNot greenFIX
Green Hosting
ActionNot green
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Apache HTTP Server✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
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
A+CO2 Per Page Load0.17g CO2 per viewPASS
CO2 Per Page Load
0.17g CO2 per view
0.17g CO2 per view
Info::
0.17g CO2 per page view
This page transfers 0.6 MB, producing an estimated 0.17g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.03g, end-user device 0.11g.
Got: 0.17g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 20.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 20.0 kg of CO2 annually — equivalent to charging 2497 smartphones.
0.17g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.6 MB
Your site
0.17g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.03g
End-user device
0.11g
At 10,000 monthly views: Monthly: 1.7 kg · Annual: 20.0 kg · ≈ 2497 smartphone charges
A+Repeat Visit Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 16 KB (vs 602 KB first visit). 27 of 28 resources are served from browser cache, saving 0.16g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.17g)
First visit
602 KB
Repeat visit
16 KB
97% reduction on repeat visits
Saving 0.16g CO2 per returning visitor
27 resources served from cache · 1 resources re-downloaded
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.17g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.17g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 72% cleaner ✓
vs Target 67% cleaner ✓
A+Transfer Efficiency96% efficientPASS
Transfer Efficiency
96% efficient
96% efficient
Info::
Transfer efficiency: 96%
Only 25 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 25 KB (4% of page weight)
Unused JS 25 KB
0.01g unnecessary CO2 per visit
Actual transfer 602 KB
Theoretical minimum 577 KB
Potential savings 25 KB (0.01g 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.