https://googlesource.com
Sustainability
· 6 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
3
INFO
0
Checks
63 PASS 3 REVIEW
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Google Cloud uses renewable energy
Info::
Google Cloud: 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 Cloud✓CDN Not identified✗
Google Cloud: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BCarbon Budget39th percentileREVIEW
Carbon Budget
39th percentile
39th percentile
Info::
0.49g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 61% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 39th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.49g
39th percentile
Cleaner than 61% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 18% cleaner ✓
vs Target 2% cleaner ✓
BTransfer Efficiency85% efficientREVIEW
Transfer Efficiency
85% efficient
85% efficient
Info::
Transfer efficiency: 85%
An estimated 313 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 313 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
Total waste: 313 KB (15% of page weight)
Unused JS 313 KB
0.07g unnecessary CO2 per visit
Actual transfer 2130 KB
Theoretical minimum 1816 KB
Potential savings 313 KB (0.07g CO2)
See Deep Analysis sections above for specific optimizations.
ACO2 Per Page Load0.49g CO2 per viewPASS
CO2 Per Page Load
0.49g CO2 per view
0.49g CO2 per view
Info::
0.49g CO2 per page view
This page transfers 2.1 MB, producing an estimated 0.49g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.10g, end-user device 0.38g.
Got: 0.49g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 59.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 59.1 kg of CO2 annually — equivalent to charging 7386 smartphones.
Info::
Green hosting reduces data center emissions
0.49g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 61% of websites
Sustainable Web Design model v4 · Page size: 2.1 MB
Your site
0.49g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.10g
End-user device
0.38g
At 10,000 monthly views: Monthly: 4.9 kg · Annual: 59.1 kg · ≈ 7386 smartphone charges
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 14 KB (vs 2130 KB first visit). 69 of 70 resources are served from browser cache, saving 0.49g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.49g)
First visit
2130 KB
Repeat visit
14 KB
99% reduction on repeat visits
Saving 0.49g CO2 per returning visitor
69 resources served from cache · 1 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: Google Cloud
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.