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https://uned.es

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
59
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.16g CO2 per view
FIX
2.16g CO2 per view
Critical::
2.16g CO2 per page view
This page transfers 7.6 MB, producing an estimated 2.16g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.40g, network 0.37g, end-user device 1.39g.
Got: 2.16g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 259.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 259.6 kg of CO2 annually — equivalent to charging 32449 smartphones.

2.16g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 7.6 MB

Your site
2.16g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.40g
Network
0.37g
End-user device
1.39g
At 10,000 monthly views: Monthly: 21.6 kg · Annual: 259.6 kg · ≈ 32449 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::
2.16g 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

2.16g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 261% more
vs Target 333% 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 28 KB (vs 7822 KB first visit). 172 of 174 resources are served from browser cache, saving 2.16g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.16g)
First visit
7822 KB
Repeat visit
28 KB

100% reduction on repeat visits

Saving 2.16g CO2 per returning visitor

172 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
99% efficient
PASS
99% efficient
Info::
Transfer efficiency: 99%
Only 100 KB of potential savings identified. Your page is well-optimized for size.
99% efficient

Total waste: 100 KB (1% of page weight)

Unused JS 100 KB

0.03g unnecessary CO2 per visit

Actual transfer 7822 KB
Theoretical minimum 7722 KB
Potential savings 100 KB (0.03g CO2)

See Deep Analysis sections above for specific optimizations.

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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