https://google.com.hk
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
DTransfer EfficiencyAction60% efficientFIX
Transfer Efficiency
Action60% efficient
60% efficient
Warning::
Transfer efficiency: 60%
An estimated 318 KB (40%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 318 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
Total waste: 318 KB (40% of page weight)
Unused JS 318 KB
0.07g unnecessary CO2 per visit
Actual transfer 795 KB
Theoretical minimum 476 KB
Potential savings 318 KB (0.07g CO2)
See Deep Analysis sections above for specific optimizations.
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Google Web Server uses renewable energy
Info::
Google Web Server: 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 Google Web Server✓CDN Not identified✗
Google Web Server: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
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: 22.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 22.1 kg of CO2 annually — equivalent to charging 2757 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: 22.1 kg · ≈ 2757 smartphone charges
A+Repeat Visit Weight91% cachedPASS
Repeat Visit Weight
91% cached
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 74 KB (vs 795 KB first visit). 46 of 47 resources are served from browser cache, saving 0.17g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.18g)
First visit
795 KB
Repeat visit
74 KB
91% reduction on repeat visits
Saving 0.17g CO2 per returning visitor
46 resources served from cache · 1 resources re-downloaded
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 69% cleaner ✓
vs Target 63% 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.