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https://www.blablacar.fr

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
76
GRADE
C
FIX
0
REVIEW
4
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 4 REVIEW
B
CO2 Per Page Load
0.60g CO2 per view
REVIEW
0.60g CO2 per view
Info::
0.60g CO2 per page view
This page transfers 2.5 MB, producing an estimated 0.60g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.46g.
Got: 0.60g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 71.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 71.5 kg of CO2 annually — equivalent to charging 8932 smartphones.
Info::
Green hosting reduces data center emissions

0.60g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 51% of websites

Sustainable Web Design model v4 · Page size: 2.5 MB

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

Energy Breakdown

Data center
0.01g
Network
0.12g
End-user device
0.46g
At 10,000 monthly views: Monthly: 6.0 kg · Annual: 71.5 kg · ≈ 8932 smartphone charges
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Google Cloud uses renewable energy
Info::
Google Cloud: Verified by the Green Web Foundation
Info::
Google Cloud CDN: Inherits Google Cloud regional renewable mix
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 Hosting✓ Green Hosted
Hosting Google Cloud✓CDN Google Cloud CDN✗

Google Cloud: Verified by the Green Web Foundation

Google Cloud CDN: Inherits Google Cloud regional renewable mix

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Carbon Budget
49th percentile
REVIEW
49th percentile
Info::
0.60g CO2 — below the median website (0.60g)
Better than an estimated 51% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 49th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.60g

49th percentile

Cleaner than 51% of websites

✗ Above the median website

vs Median 1% cleaner ✓
vs Target 19% more
C
Transfer Efficiency
Action
74% efficient
REVIEW
74% efficient
Warning::
Transfer efficiency: 74%
An estimated 657 KB (26%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 657 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
74% efficient

Total waste: 657 KB (26% of page weight)

Unused JS 657 KB

0.15g unnecessary CO2 per visit

Actual transfer 2576 KB
Theoretical minimum 1918 KB
Potential savings 657 KB (0.15g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Repeat Visit Weight
91% cached
PASS
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 232 KB (vs 2576 KB first visit). 91 of 93 resources are served from browser cache, saving 0.54g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 0.60g)
First visit
2576 KB
Repeat visit
232 KB

91% reduction on repeat visits

Saving 0.54g CO2 per returning visitor

91 resources served from cache · 2 resources re-downloaded

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

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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