https://googleblog.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
86
GRADE
B
FIX
0
REVIEW
1
PASS
5
INFO
0
Checks
65 PASS 1 REVIEW
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
ACO2 Per Page Load0.34g CO2 per viewPASS
CO2 Per Page Load
0.34g CO2 per view
0.34g CO2 per view
Info::
0.34g CO2 per page view
This page transfers 1.4 MB, producing an estimated 0.34g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.26g.
Got: 0.34g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 41.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 41.0 kg of CO2 annually — equivalent to charging 5121 smartphones.
Info::
Green hosting reduces data center emissions
0.34g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 76% of websites
Sustainable Web Design model v4 · Page size: 1.4 MB
Your site
0.34g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.07g
End-user device
0.26g
At 10,000 monthly views: Monthly: 3.4 kg · Annual: 41.0 kg · ≈ 5121 smartphone charges
A+Repeat Visit Weight96% cachedPASS
Repeat Visit Weight
96% cached
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 60 KB (vs 1477 KB first visit). 57 of 58 resources are served from browser cache, saving 0.33g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.34g)
First visit
1477 KB
Repeat visit
60 KB
96% reduction on repeat visits
Saving 0.33g CO2 per returning visitor
57 resources served from cache · 1 resources re-downloaded
ACarbon Budget24th percentilePASS
Carbon Budget
24th percentile
24th percentile
Info::
0.34g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 76% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 24th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.34g
24th percentile
Cleaner than 76% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 43% cleaner ✓
vs Target 32% cleaner ✓
A+Transfer Efficiency91% efficientPASS
Transfer Efficiency
91% efficient
91% efficient
Info::
Transfer efficiency: 91%
Only 139 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 139 KB (9% of page weight)
Unused JS 139 KB
0.03g unnecessary CO2 per visit
Actual transfer 1477 KB
Theoretical minimum 1337 KB
Potential savings 139 KB (0.03g CO2)
See Deep Analysis sections above for specific optimizations.
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.