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 LoadAction1.53g CO2 per viewFIX
CO2 Per Page Load
Action1.53g CO2 per view
1.53g CO2 per view
Warning::
1.53g CO2 per page view
This page transfers 5.4 MB, producing an estimated 1.53g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.28g, network 0.27g, end-user device 0.98g.
Got: 1.53g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 184.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 184.0 kg of CO2 annually — equivalent to charging 23002 smartphones.
1.53g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 24% of websites
Sustainable Web Design model v4 · Page size: 5.4 MB
Your site
1.53g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.28g
Network
0.27g
End-user device
0.98g
At 10,000 monthly views: Monthly: 15.3 kg · Annual: 184.0 kg · ≈ 23002 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 BudgetAction76th percentileFIX
Carbon Budget
Action76th percentile
76th percentile
Warning::
1.53g CO2 — above the median website (0.60g)
Heavier than an estimated 24% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 76th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.53g
76th percentile
Cleaner than 24% of websites
✗ Above the median website
vs Median 156% more
vs Target 207% more
CTransfer EfficiencyAction68% efficientREVIEW
Transfer Efficiency
Action68% efficient
68% efficient
Warning::
Transfer efficiency: 68%
An estimated 1781 KB (32%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1781 KB of unused JavaScript. This wasted data produces 0.49g of unnecessary CO2 per page view.
Total waste: 1781 KB (32% of page weight)
Unused JS 1781 KB
0.49g unnecessary CO2 per visit
Actual transfer 5544 KB
Theoretical minimum 3763 KB
Potential savings 1781 KB (0.49g 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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 102 KB (vs 5544 KB first visit). 107 of 109 resources are served from browser cache, saving 1.51g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.53g)
First visit
5544 KB
Repeat visit
102 KB
98% reduction on repeat visits
Saving 1.51g CO2 per returning visitor
107 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.