https://trezor.io
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
72
GRADE
C
FIX
2
REVIEW
0
PASS
4
INFO
0
Checks
64 PASS 2 FIX
FCO2 Per Page LoadAction1.64g CO2 per viewFIX
CO2 Per Page Load
Action1.64g CO2 per view
1.64g CO2 per view
Warning::
1.64g CO2 per page view
This page transfers 6.9 MB, producing an estimated 1.64g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.34g, end-user device 1.26g.
Got: 1.64g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 197.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 197.2 kg of CO2 annually — equivalent to charging 24648 smartphones.
Info::
Green hosting reduces data center emissions
1.64g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 21% of websites
Sustainable Web Design model v4 · Page size: 6.9 MB
Your site
1.64g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.04g
Network
0.34g
End-user device
1.26g
At 10,000 monthly views: Monthly: 16.4 kg · Annual: 197.2 kg · ≈ 24648 smartphone charges
FCarbon BudgetAction79th percentileFIX
Carbon Budget
Action79th percentile
79th percentile
Warning::
1.64g CO2 — above the median website (0.60g)
Heavier than an estimated 21% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 79th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.64g
79th percentile
Cleaner than 21% of websites
✗ Above the median website
vs Median 174% more
vs Target 229% more
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Cloudflare
Info::
Next.js: 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 Next.js✓CDN Cloudflare✓
Next.js: 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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 148 KB (vs 7109 KB first visit). 112 of 116 resources are served from browser cache, saving 1.61g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.64g)
First visit
7109 KB
Repeat visit
148 KB
98% reduction on repeat visits
Saving 1.61g CO2 per returning visitor
112 resources served from cache · 4 resources re-downloaded
A+Transfer Efficiency91% efficientPASS
Transfer Efficiency
91% efficient
91% efficient
Info::
Transfer efficiency: 91%
Only 659 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 659 KB (9% of page weight)
Unused JS 659 KB
0.15g unnecessary CO2 per visit
Actual transfer 7109 KB
Theoretical minimum 6450 KB
Potential savings 659 KB (0.15g 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.