https://mofos.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
61
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
82 PASS 2 REVIEW 3 FIX
FCO2 Per Page LoadAction2.28g CO2 per viewFIX
CO2 Per Page Load
Action2.28g CO2 per view
2.28g CO2 per view
Critical::
2.28g CO2 per page view
This page transfers 8.0 MB, producing an estimated 2.28g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.42g, network 0.39g, end-user device 1.46g.
Got: 2.28g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 273.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 273.4 kg of CO2 annually — equivalent to charging 34173 smartphones.
2.28g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 8.0 MB
Your site
2.28g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.42g
Network
0.39g
End-user device
1.46g
At 10,000 monthly views: Monthly: 22.8 kg · Annual: 273.4 kg · ≈ 34173 smartphone charges
DGreen HostingActionUnknownFIX
Green Hosting
ActionUnknown
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.28g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
2.28g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 280% more
vs Target 356% more
CTransfer EfficiencyAction73% efficientREVIEW
Transfer Efficiency
Action73% efficient
73% efficient
Warning::
Transfer efficiency: 73%
An estimated 2263 KB (27%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2263 KB of unused JavaScript. This wasted data produces 0.63g of unnecessary CO2 per page view.
Total waste: 2263 KB (27% of page weight)
Unused JS 2263 KB
0.63g unnecessary CO2 per visit
Actual transfer 8237 KB
Theoretical minimum 5974 KB
Potential savings 2263 KB (0.63g CO2)
See Deep Analysis sections above for specific optimizations.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 106 KB (vs 8237 KB first visit). 113 of 115 resources are served from browser cache, saving 2.25g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 2.28g)
First visit
8237 KB
Repeat visit
106 KB
99% reduction on repeat visits
Saving 2.25g CO2 per returning visitor
113 resources served from cache · 2 resources re-downloaded
A+Web Font Weight Variants3 font weights loaded across 2 famil(y/ies) -- reasonablePASS
Web Font Weight Variants
3 font weights loaded across 2 famil(y/ies) -- reasonable
3 font weights loaded across 2 famil(y/ies) -- reasonable
Info::
3 font weight(s) loaded across 2 famil(y/ies)
Image Optimization18 images, 0 KB total, 0 KB wastedINFO
Image Optimization
18 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
18
Total Size
0 KB
Oversized
10
18 missing dimensions 10 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.