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https://vueling.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
60
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
2.99g CO2 per view
FIX
2.99g CO2 per view
Critical::
2.99g CO2 per page view
This page transfers 10.6 MB, producing an estimated 2.99g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.55g, network 0.52g, end-user device 1.92g.
Got: 2.99g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 358.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 358.9 kg of CO2 annually — equivalent to charging 44856 smartphones.

2.99g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 10.6 MB

Your site
2.99g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.55g
Network
0.52g
End-user device
1.92g
At 10,000 monthly views: Monthly: 29.9 kg · Annual: 358.9 kg · ≈ 44856 smartphone charges
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
Info::
Akamai: Committed to 50% renewable by 2030
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 HostingNot Green Hosted
Hosting Not identified✗CDN Akamai✗

Akamai: Committed to 50% renewable by 2030

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.99g 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

2.99g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 398% more
vs Target 498% 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 32 KB (vs 10812 KB first visit). 194 of 195 resources are served from browser cache, saving 2.98g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 2.99g)
First visit
10812 KB
Repeat visit
32 KB

100% reduction on repeat visits

Saving 2.98g CO2 per returning visitor

194 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 864 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 864 KB (8% of page weight)

Unused JS 864 KB

0.24g unnecessary CO2 per visit

Actual transfer 10812 KB
Theoretical minimum 9948 KB
Potential savings 864 KB (0.24g 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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