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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 LoadAction0.97g CO2 per viewFIX
CO2 Per Page Load
Action0.97g CO2 per view
0.97g CO2 per view
Info::
0.97g CO2 per page view
This page transfers 4.1 MB, producing an estimated 0.97g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.20g, end-user device 0.74g.
Got: 0.97g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 116.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 116.3 kg of CO2 annually — equivalent to charging 14542 smartphones.
Info::
Green hosting reduces data center emissions
0.97g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 40% of websites
Sustainable Web Design model v4 · Page size: 4.1 MB
Your site
0.97g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.20g
End-user device
0.74g
At 10,000 monthly views: Monthly: 9.7 kg · Annual: 116.3 kg · ≈ 14542 smartphone charges
DCarbon BudgetAction60th percentileFIX
Carbon Budget
Action60th percentile
60th percentile
Warning::
0.97g CO2 — above the median website (0.60g)
Heavier than an estimated 40% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 60th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.97g
60th percentile
Cleaner than 40% of websites
✗ Above the median website
vs Median 62% more
vs Target 94% 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 Weight83% cachedPASS
Repeat Visit Weight
83% cached
83% cached
Info::
83% reduction on repeat visits
Returning visitors download only 719 KB (vs 4194 KB first visit). 251 of 286 resources are served from browser cache, saving 0.80g CO2 per repeat visit.
Info::
Repeat visit: 0.17g CO2 (first visit: 0.97g)
First visit
4194 KB
Repeat visit
719 KB
83% reduction on repeat visits
Saving 0.80g CO2 per returning visitor
251 resources served from cache · 35 resources re-downloaded
A+Transfer Efficiency98% efficientPASS
Transfer Efficiency
98% efficient
98% efficient
Info::
Transfer efficiency: 98%
Only 96 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 96 KB (2% of page weight)
Unused JS 96 KB
0.02g unnecessary CO2 per visit
Actual transfer 4194 KB
Theoretical minimum 4098 KB
Potential savings 96 KB (0.02g 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.