https://ki.se
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
70
GRADE
C
FIX
2
REVIEW
3
PASS
1
INFO
0
Checks
61 PASS 3 REVIEW 2 FIX
DGreen HostingActionUnknownFIX
Green Hosting
ActionUnknown
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
DCarbon BudgetAction54th percentileFIX
Carbon Budget
Action54th percentile
54th percentile
Warning::
0.77g CO2 — above the median website (0.60g)
Heavier than an estimated 46% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 54th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.77g
54th percentile
Cleaner than 46% of websites
✗ Above the median website
vs Median 28% more
vs Target 53% more
BCO2 Per Page Load0.77g CO2 per viewREVIEW
CO2 Per Page Load
0.77g CO2 per view
0.77g CO2 per view
Info::
0.77g CO2 per page view
This page transfers 2.7 MB, producing an estimated 0.77g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.14g, network 0.13g, end-user device 0.49g.
Got: 0.77g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 91.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 91.9 kg of CO2 annually — equivalent to charging 11488 smartphones.
0.77g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 46% of websites
Sustainable Web Design model v4 · Page size: 2.7 MB
Your site
0.77g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.14g
Network
0.13g
End-user device
0.49g
At 10,000 monthly views: Monthly: 7.7 kg · Annual: 91.9 kg · ≈ 11488 smartphone charges
BTransfer Efficiency81% efficientREVIEW
Transfer Efficiency
81% efficient
81% efficient
Info::
Transfer efficiency: 81%
An estimated 516 KB (19%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 516 KB of unused JavaScript. This wasted data produces 0.14g of unnecessary CO2 per page view.
Total waste: 516 KB (19% of page weight)
Unused JS 516 KB
0.14g unnecessary CO2 per visit
Actual transfer 2769 KB
Theoretical minimum 2253 KB
Potential savings 516 KB (0.14g 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
A+Repeat Visit Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 74 KB (vs 2769 KB first visit). 57 of 58 resources are served from browser cache, saving 0.75g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.77g)
First visit
2769 KB
Repeat visit
74 KB
97% reduction on repeat visits
Saving 0.75g CO2 per returning visitor
57 resources served from cache · 1 resources re-downloaded
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.