https://cnil.fr
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
84
GRADE
B
FIX
1
REVIEW
1
PASS
4
INFO
0
Checks
64 PASS 1 REVIEW 1 FIX
DCarbon BudgetAction53th percentileFIX
Carbon Budget
Action53th percentile
53th percentile
Warning::
0.73g CO2 — above the median website (0.60g)
Heavier than an estimated 47% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 53th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.73g
53rd percentile
Cleaner than 47% of websites
✗ Above the median website
vs Median 22% more
vs Target 46% more
BCO2 Per Page Load0.73g CO2 per viewREVIEW
CO2 Per Page Load
0.73g CO2 per view
0.73g CO2 per view
Info::
0.73g CO2 per page view
This page transfers 3.1 MB, producing an estimated 0.73g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.15g, end-user device 0.56g.
Got: 0.73g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 87.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 87.7 kg of CO2 annually — equivalent to charging 10956 smartphones.
Info::
Green hosting reduces data center emissions
0.73g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 47% of websites
Sustainable Web Design model v4 · Page size: 3.1 MB
Your site
0.73g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.15g
End-user device
0.56g
At 10,000 monthly views: Monthly: 7.3 kg · Annual: 87.7 kg · ≈ 10956 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Cloudflare✓CDN Cloudflare✓
Cloudflare: Verified by the Green Web Foundation
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 15 KB (vs 3160 KB first visit). 124 of 125 resources are served from browser cache, saving 0.73g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.73g)
First visit
3160 KB
Repeat visit
15 KB
100% reduction on repeat visits
Saving 0.73g CO2 per returning visitor
124 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency99% efficientPASS
Transfer Efficiency
99% efficient
99% efficient
Info::
Transfer efficiency: 99%
Only 29 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 29 KB (1% of page weight)
Unused JS 29 KB
0.01g unnecessary CO2 per visit
Actual transfer 3160 KB
Theoretical minimum 3130 KB
Potential savings 29 KB (0.01g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.