https://sites.google.com
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
1
REVIEW
2
PASS
3
INFO
0
Checks
63 PASS 2 REVIEW 1 FIX
DTransfer EfficiencyAction55% efficientFIX
Transfer Efficiency
Action55% efficient
55% efficient
Warning::
Transfer efficiency: 55%
An estimated 348 KB (45%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 348 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.
Total waste: 348 KB (45% of page weight)
Unused JS 348 KB
0.08g unnecessary CO2 per visit
Actual transfer 768 KB
Theoretical minimum 419 KB
Potential savings 348 KB (0.08g CO2)
See Deep Analysis sections above for specific optimizations.
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
OpenGSE uses renewable energy
Info::
OpenGSE: Verified by the Green Web Foundation
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 OpenGSE✓CDN Not identified✗
OpenGSE: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BRepeat Visit Weight78% cachedREVIEW
Repeat Visit Weight
78% cached
78% cached
Info::
78% reduction on repeat visits
Returning visitors download only 170 KB (vs 768 KB first visit). 21 of 24 resources are served from browser cache, saving 0.14g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.18g)
First visit
768 KB
Repeat visit
170 KB
78% reduction on repeat visits
Saving 0.14g CO2 per returning visitor
21 resources served from cache · 3 resources re-downloaded
A+CO2 Per Page Load0.18g CO2 per viewPASS
CO2 Per Page Load
0.18g CO2 per view
0.18g CO2 per view
Info::
0.18g CO2 per page view
This page transfers 0.8 MB, producing an estimated 0.18g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.04g, end-user device 0.14g.
Got: 0.18g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 21.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 21.3 kg of CO2 annually — equivalent to charging 2662 smartphones.
Info::
Green hosting reduces data center emissions
0.18g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.8 MB
Your site
0.18g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.00g
Network
0.04g
End-user device
0.14g
At 10,000 monthly views: Monthly: 1.8 kg · Annual: 21.3 kg · ≈ 2662 smartphone charges
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.18g 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
0.18g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 70% cleaner ✓
vs Target 64% cleaner ✓
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: Google Cloud
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.