Skip to content
https://uniqlo.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
50
GRADE
F
FIX
4
REVIEW
1
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 1 REVIEW 4 FIX
F
CO2 Per Page Load
Action
1.68g CO2 per view
FIX
1.68g CO2 per view
Warning::
1.68g CO2 per page view
This page transfers 5.9 MB, producing an estimated 1.68g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.31g, network 0.29g, end-user device 1.08g.
Got: 1.68g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 201.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 201.5 kg of CO2 annually — equivalent to charging 25185 smartphones.

1.68g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 20% of websites

Sustainable Web Design model v4 · Page size: 5.9 MB

Your site
1.68g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.31g
Network
0.29g
End-user device
1.08g
At 10,000 monthly views: Monthly: 16.8 kg · Annual: 201.5 kg · ≈ 25185 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
80th percentile
FIX
80th percentile
Warning::
1.68g CO2 — above the median website (0.60g)
Heavier than an estimated 20% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 80th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.68g

80th percentile

Cleaner than 20% of websites

✗ Above the median website

vs Median 180% more
vs Target 236% more
D
Transfer Efficiency
Action
60% efficient
FIX
60% efficient
Warning::
Transfer efficiency: 60%
An estimated 2430 KB (40%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2430 KB of unused JavaScript. This wasted data produces 0.67g of unnecessary CO2 per page view.
60% efficient

Total waste: 2430 KB (40% of page weight)

Unused JS 2430 KB

0.67g unnecessary CO2 per visit

Actual transfer 6071 KB
Theoretical minimum 3640 KB
Potential savings 2430 KB (0.67g 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 210 KB (vs 6071 KB first visit). 251 of 257 resources are served from browser cache, saving 1.62g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 1.68g)
First visit
6071 KB
Repeat visit
210 KB

97% reduction on repeat visits

Saving 1.62g CO2 per returning visitor

251 resources served from cache · 6 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback