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https://uniqlo.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
58
GRADE
D
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.93g CO2 per view
FIX
1.93g CO2 per view
Warning::
1.93g CO2 per page view
This page transfers 6.8 MB, producing an estimated 1.93g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.36g, network 0.33g, end-user device 1.24g.
Got: 1.93g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 231.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 231.6 kg of CO2 annually — equivalent to charging 28943 smartphones.

1.93g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 13% of websites

Sustainable Web Design model v4 · Page size: 6.8 MB

Your site
1.93g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.36g
Network
0.33g
End-user device
1.24g
At 10,000 monthly views: Monthly: 19.3 kg · Annual: 231.6 kg · ≈ 28943 smartphone charges
D
Green Hosting
Action
Unknown
FIX
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

F
Carbon Budget
Action
87th percentile
FIX
87th percentile
Warning::
1.93g CO2 — above the median website (0.60g)
Heavier than an estimated 13% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 87th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.93g

87th percentile

Cleaner than 13% of websites

✗ Above the median website

vs Median 222% more
vs Target 286% more
B
Transfer Efficiency
83% efficient
REVIEW
83% efficient
Info::
Transfer efficiency: 83%
An estimated 1182 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1182 KB of unused JavaScript. This wasted data produces 0.33g of unnecessary CO2 per page view.
83% efficient

Total waste: 1182 KB (17% of page weight)

Unused JS 1182 KB

0.33g unnecessary CO2 per visit

Actual transfer 6977 KB
Theoretical minimum 5794 KB
Potential savings 1182 KB (0.33g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 222 KB (vs 6977 KB first visit). 92 of 93 resources are served from browser cache, saving 1.87g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 1.93g)
First visit
6977 KB
Repeat visit
222 KB

97% reduction on repeat visits

Saving 1.87g CO2 per returning visitor

92 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.

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