Skip to content
https://ukuat.org

Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
63
GRADE
D
FIX
3
REVIEW
1
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
6.42g CO2 per view
FIX
6.42g CO2 per view
Critical::
6.42g CO2 per page view
This page transfers 22.7 MB, producing an estimated 6.42g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 1.19g, network 1.11g, end-user device 4.12g.
Got: 6.42g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 770.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 770.1 kg of CO2 annually — equivalent to charging 96256 smartphones.

6.42g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 22.7 MB

Your site
6.42g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
1.19g
Network
1.11g
End-user device
4.12g
At 10,000 monthly views: Monthly: 64.2 kg · Annual: 770.1 kg · ≈ 96256 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
95th percentile
FIX
95th percentile
Warning::
6.42g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

6.42g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 970% more
vs Target 1183% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 81 KB (vs 23203 KB first visit). 151 of 153 resources are served from browser cache, saving 6.39g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 6.42g)
First visit
23203 KB
Repeat visit
81 KB

100% reduction on repeat visits

Saving 6.39g CO2 per returning visitor

151 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 566 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 566 KB (2% of page weight)

Unused JS 566 KB

0.16g unnecessary CO2 per visit

Actual transfer 23203 KB
Theoretical minimum 22636 KB
Potential savings 566 KB (0.16g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Web Font Weight Variants
1 font weights loaded across 1 famil(y/ies) -- reasonable
PASS
1 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
1 font weight(s) loaded across 1 famil(y/ies)
Image Optimization
48 images, 294 KB total, 94 KB wasted
INFO

Image Optimization Audit

Total Images

48

Total Size

294 KB

Oversized

1

Wasted

94 KB

1 missing alt text 1 missing dimensions 4 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback