https://asha.org
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
1
REVIEW
2
PASS
3
INFO
0
Checks
63 PASS 2 REVIEW 1 FIX
DCarbon BudgetAction54th percentileFIX
Carbon Budget
Action54th percentile
54th percentile
Warning::
0.77g CO2 — above the median website (0.60g)
Heavier than an estimated 46% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 54th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.77g
54th percentile
Cleaner than 46% of websites
✗ Above the median website
vs Median 29% more
vs Target 55% more
BCO2 Per Page Load0.77g CO2 per viewREVIEW
CO2 Per Page Load
0.77g CO2 per view
0.77g CO2 per view
Info::
0.77g CO2 per page view
This page transfers 3.3 MB, producing an estimated 0.77g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.16g, end-user device 0.59g.
Got: 0.77g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 92.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 92.8 kg of CO2 annually — equivalent to charging 11605 smartphones.
Info::
Green hosting reduces data center emissions
0.77g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 46% of websites
Sustainable Web Design model v4 · Page size: 3.3 MB
Your site
0.77g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.16g
End-user device
0.59g
At 10,000 monthly views: Monthly: 7.7 kg · Annual: 92.8 kg · ≈ 11605 smartphone charges
CTransfer EfficiencyAction75% efficientREVIEW
Transfer Efficiency
Action75% efficient
75% efficient
Warning::
Transfer efficiency: 75%
An estimated 838 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 838 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
Total waste: 838 KB (25% of page weight)
Unused JS 838 KB
0.19g unnecessary CO2 per visit
Actual transfer 3347 KB
Theoretical minimum 2508 KB
Potential savings 838 KB (0.19g 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: Azure, CDN: Cloudflare
Info::
Azure: 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 Azure✓CDN Cloudflare✓
Azure: 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 20 KB (vs 3347 KB first visit). 115 of 116 resources are served from browser cache, saving 0.77g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.77g)
First visit
3347 KB
Repeat visit
20 KB
99% reduction on repeat visits
Saving 0.77g CO2 per returning visitor
115 resources served from cache · 1 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.