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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
0.56g CO2 per view
REVIEW
0.56g CO2 per view
Info::
0.56g CO2 per page view
This page transfers 2.4 MB, producing an estimated 0.56g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.43g.
Got: 0.56g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 67.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 67.3 kg of CO2 annually — equivalent to charging 8408 smartphones.
Info::
Green hosting reduces data center emissions

0.56g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 54% of websites

Sustainable Web Design model v4 · Page size: 2.4 MB

Your site
0.56g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.12g
End-user device
0.43g
At 10,000 monthly views: Monthly: 5.6 kg · Annual: 67.3 kg · ≈ 8408 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
46th percentile
REVIEW
46th percentile
Info::
0.56g CO2 — below the median website (0.60g)
Better than an estimated 54% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 46th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.56g

46th percentile

Cleaner than 54% of websites

✗ Above the median website

vs Median 7% cleaner ✓
vs Target 12% more
C
Transfer Efficiency
Action
73% efficient
REVIEW
73% efficient
Warning::
Transfer efficiency: 73%
An estimated 655 KB (27%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 655 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
73% efficient

Total waste: 655 KB (27% of page weight)

Unused JS 655 KB

0.15g unnecessary CO2 per visit

Actual transfer 2425 KB
Theoretical minimum 1769 KB
Potential savings 655 KB (0.15g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 20 KB (vs 2425 KB first visit). 77 of 78 resources are served from browser cache, saving 0.56g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.56g)
First visit
2425 KB
Repeat visit
20 KB

99% reduction on repeat visits

Saving 0.56g CO2 per returning visitor

77 resources served from cache · 1 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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