https://starbucks.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
71
GRADE
C
FIX
1
REVIEW
3
PASS
2
INFO
0
Checks
62 PASS 3 REVIEW 1 FIX
DGreen HostingActionNot greenFIX
Green Hosting
ActionNot green
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
Info::
Azure: Microsoft is carbon-negative; Azure renewable varies by region
Info::
Azure CDN: Inherits Azure regional renewable mix
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 HostingNot Green Hosted
Hosting Azure✗CDN Azure CDN✗
Azure: Microsoft is carbon-negative; Azure renewable varies by region
Azure CDN: Inherits Azure regional renewable mix
Based on known provider commitments. Verify at thegreenwebfoundation.org
BCarbon Budget34th percentileREVIEW
Carbon Budget
34th percentile
34th percentile
Info::
0.45g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 66% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 34th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.45g
34th percentile
Cleaner than 66% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 26% cleaner ✓
vs Target 11% cleaner ✓
CTransfer EfficiencyAction72% efficientREVIEW
Transfer Efficiency
Action72% efficient
72% efficient
Warning::
Transfer efficiency: 72%
An estimated 459 KB (28%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 459 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.
Total waste: 459 KB (28% of page weight)
Unused JS 459 KB
0.13g unnecessary CO2 per visit
Actual transfer 1614 KB
Theoretical minimum 1155 KB
Potential savings 459 KB (0.13g CO2)
See Deep Analysis sections above for specific optimizations.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
ACO2 Per Page Load0.45g CO2 per viewPASS
CO2 Per Page Load
0.45g CO2 per view
0.45g CO2 per view
Info::
0.45g CO2 per page view
This page transfers 1.6 MB, producing an estimated 0.45g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.08g, end-user device 0.29g.
Got: 0.45g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 53.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 53.6 kg of CO2 annually — equivalent to charging 6699 smartphones.
0.45g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 66% of websites
Sustainable Web Design model v4 · Page size: 1.6 MB
Your site
0.45g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.08g
Network
0.08g
End-user device
0.29g
At 10,000 monthly views: Monthly: 4.5 kg · Annual: 53.6 kg · ≈ 6699 smartphone charges
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 30 KB (vs 1614 KB first visit). 53 of 56 resources are served from browser cache, saving 0.44g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.45g)
First visit
1614 KB
Repeat visit
30 KB
98% reduction on repeat visits
Saving 0.44g CO2 per returning visitor
53 resources served from cache · 3 resources re-downloaded
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.