https://globalsign.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
87
GRADE
B
FIX
0
REVIEW
2
PASS
4
INFO
0
Checks
64 PASS 2 REVIEW
BCarbon Budget32th percentileREVIEW
Carbon Budget
32th percentile
32th percentile
Info::
0.43g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 68% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 32th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.43g
32nd percentile
Cleaner than 68% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 29% cleaner ✓
vs Target 15% cleaner ✓
BTransfer Efficiency90% efficientREVIEW
Transfer Efficiency
90% efficient
90% efficient
Info::
Transfer efficiency: 90%
An estimated 187 KB (10%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 187 KB of unused JavaScript. This wasted data produces 0.04g of unnecessary CO2 per page view.
Total waste: 187 KB (10% of page weight)
Unused JS 187 KB
0.04g unnecessary CO2 per visit
Actual transfer 1839 KB
Theoretical minimum 1651 KB
Potential savings 187 KB (0.04g CO2)
See Deep Analysis sections above for specific optimizations.
ACO2 Per Page Load0.43g CO2 per viewPASS
CO2 Per Page Load
0.43g CO2 per view
0.43g CO2 per view
Info::
0.43g CO2 per page view
This page transfers 1.8 MB, producing an estimated 0.43g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.09g, end-user device 0.33g.
Got: 0.43g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 51.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 51.0 kg of CO2 annually — equivalent to charging 6376 smartphones.
Info::
Green hosting reduces data center emissions
0.43g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 68% of websites
Sustainable Web Design model v4 · Page size: 1.8 MB
Your site
0.43g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.09g
End-user device
0.33g
At 10,000 monthly views: Monthly: 4.3 kg · Annual: 51.0 kg · ≈ 6376 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Fastly
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Fastly: 100% renewable energy for edge network
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 Fastly✓
Cloudflare: Verified by the Green Web Foundation
Fastly: 100% renewable energy for edge network
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 27 KB (vs 1839 KB first visit). 126 of 131 resources are served from browser cache, saving 0.42g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.43g)
First visit
1839 KB
Repeat visit
27 KB
99% reduction on repeat visits
Saving 0.42g CO2 per returning visitor
126 resources served from cache · 5 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
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.