https://publicbang.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
83
GRADE
B
FIX
0
REVIEW
3
PASS
4
INFO
1
Checks
84 PASS 3 REVIEW
BCO2 Per Page Load0.62g CO2 per viewREVIEW
CO2 Per Page Load
0.62g CO2 per view
0.62g CO2 per view
Info::
0.62g CO2 per page view
This page transfers 2.6 MB, producing an estimated 0.62g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.13g, end-user device 0.47g.
Got: 0.62g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 73.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 73.8 kg of CO2 annually — equivalent to charging 9227 smartphones.
Info::
Green hosting reduces data center emissions
0.62g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 50% of websites
Sustainable Web Design model v4 · Page size: 2.6 MB
Your site
0.62g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.13g
End-user device
0.47g
At 10,000 monthly views: Monthly: 6.2 kg · Annual: 73.8 kg · ≈ 9227 smartphone charges
BCarbon Budget50th percentileREVIEW
Carbon Budget
50th percentile
50th percentile
Warning::
0.62g CO2 — above the median website (0.60g)
Heavier than an estimated 50% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 50th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.62g
50th percentile
Cleaner than 50% of websites
✗ Above the median website
vs Median 3% more
vs Target 23% more
CTransfer EfficiencyAction69% efficientREVIEW
Transfer Efficiency
Action69% efficient
69% efficient
Warning::
Transfer efficiency: 69%
An estimated 825 KB (31%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 825 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
Total waste: 825 KB (31% of page weight)
Unused JS 825 KB
0.19g unnecessary CO2 per visit
Actual transfer 2661 KB
Theoretical minimum 1835 KB
Potential savings 825 KB (0.19g CO2)
See Deep Analysis sections above for specific optimizations.
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 Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 87 KB (vs 2661 KB first visit). 85 of 86 resources are served from browser cache, saving 0.59g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.62g)
First visit
2661 KB
Repeat visit
87 KB
97% reduction on repeat visits
Saving 0.59g CO2 per returning visitor
85 resources served from cache · 1 resources re-downloaded
A+Web Font Weight Variants2 font weights loaded across 2 famil(y/ies) -- reasonablePASS
Web Font Weight Variants
2 font weights loaded across 2 famil(y/ies) -- reasonable
2 font weights loaded across 2 famil(y/ies) -- reasonable
Info::
2 font weight(s) loaded across 2 famil(y/ies)
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 Optimization11 images, 0 KB total, 0 KB wastedINFO
Image Optimization
11 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
11
Total Size
0 KB
Oversized
5
11 missing dimensions 4 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.