https://www.allbirds.eu
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
80
GRADE
B
FIX
2
REVIEW
0
PASS
4
INFO
0
Checks
64 PASS 2 FIX
DCO2 Per Page LoadAction1.45g CO2 per viewFIX
CO2 Per Page Load
Action1.45g CO2 per view
1.45g CO2 per view
Warning::
1.45g CO2 per page view
This page transfers 6.1 MB, producing an estimated 1.45g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.30g, end-user device 1.11g.
Got: 1.45g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 173.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 173.9 kg of CO2 annually — equivalent to charging 21740 smartphones.
Info::
Green hosting reduces data center emissions
1.45g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 26% of websites
Sustainable Web Design model v4 · Page size: 6.1 MB
Your site
1.45g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.04g
Network
0.30g
End-user device
1.11g
At 10,000 monthly views: Monthly: 14.5 kg · Annual: 173.9 kg · ≈ 21740 smartphone charges
FCarbon BudgetAction74th percentileFIX
Carbon Budget
Action74th percentile
74th percentile
Warning::
1.45g CO2 — above the median website (0.60g)
Heavier than an estimated 26% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 74th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.45g
74th percentile
Cleaner than 26% of websites
✗ Above the median website
vs Median 142% more
vs Target 190% more
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 Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 56 KB (vs 6270 KB first visit). 208 of 210 resources are served from browser cache, saving 1.44g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.45g)
First visit
6270 KB
Repeat visit
56 KB
99% reduction on repeat visits
Saving 1.44g CO2 per returning visitor
208 resources served from cache · 2 resources re-downloaded
A+Transfer Efficiency97% efficientPASS
Transfer Efficiency
97% efficient
97% efficient
Info::
Transfer efficiency: 97%
Only 175 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 175 KB (3% of page weight)
Unused JS 175 KB
0.04g unnecessary CO2 per visit
Actual transfer 6270 KB
Theoretical minimum 6095 KB
Potential savings 175 KB (0.04g 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.