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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
84
GRADE
B
FIX
0
REVIEW
3
PASS
3
INFO
0
Checks
63 PASS 3 REVIEW
BCO2 Per Page Load0.59g CO2 per viewREVIEW
CO2 Per Page Load
0.59g CO2 per view
0.59g CO2 per view
Info::
0.59g CO2 per page view
This page transfers 2.5 MB, producing an estimated 0.59g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.45g.
Got: 0.59g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 70.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 70.8 kg of CO2 annually — equivalent to charging 8852 smartphones.
Info::
Green hosting reduces data center emissions
0.59g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 51% of websites
Sustainable Web Design model v4 · Page size: 2.5 MB
Your site
0.59g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.12g
End-user device
0.45g
At 10,000 monthly views: Monthly: 5.9 kg · Annual: 70.8 kg · ≈ 8852 smartphone charges
BCarbon Budget49th percentileREVIEW
Carbon Budget
49th percentile
49th percentile
Info::
0.59g CO2 — below the median website (0.60g)
Better than an estimated 51% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 49th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.59g
49th percentile
Cleaner than 51% of websites
✗ Above the median website
vs Median 2% cleaner ✓
vs Target 18% more
BTransfer Efficiency80% efficientREVIEW
Transfer Efficiency
80% efficient
80% efficient
Info::
Transfer efficiency: 80%
An estimated 501 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 501 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.
Total waste: 501 KB (20% of page weight)
Unused JS 501 KB
0.12g unnecessary CO2 per visit
Actual transfer 2553 KB
Theoretical minimum 2051 KB
Potential savings 501 KB (0.12g CO2)
See Deep Analysis sections above for specific optimizations.
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 Weight91% cachedPASS
Repeat Visit Weight
91% cached
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 228 KB (vs 2553 KB first visit). 119 of 122 resources are served from browser cache, saving 0.54g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 0.59g)
First visit
2553 KB
Repeat visit
228 KB
91% reduction on repeat visits
Saving 0.54g CO2 per returning visitor
119 resources served from cache · 3 resources re-downloaded
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.