https://um.es
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
74
GRADE
C
FIX
1
REVIEW
4
PASS
1
INFO
0
Checks
61 PASS 4 REVIEW 1 FIX
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
BCO2 Per Page Load0.54g CO2 per viewREVIEW
CO2 Per Page Load
0.54g CO2 per view
0.54g CO2 per view
Info::
0.54g CO2 per page view
This page transfers 1.9 MB, producing an estimated 0.54g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.09g, end-user device 0.35g.
Got: 0.54g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 64.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 64.9 kg of CO2 annually — equivalent to charging 8116 smartphones.
0.54g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 56% of websites
Sustainable Web Design model v4 · Page size: 1.9 MB
Your site
0.54g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.10g
Network
0.09g
End-user device
0.35g
At 10,000 monthly views: Monthly: 5.4 kg · Annual: 64.9 kg · ≈ 8116 smartphone charges
BCarbon Budget44th percentileREVIEW
Carbon Budget
44th percentile
44th percentile
Info::
0.54g CO2 — below the median website (0.60g)
Better than an estimated 56% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 44th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.54g
44th percentile
Cleaner than 56% of websites
✗ Above the median website
vs Median 10% cleaner ✓
vs Target 8% more
BTransfer Efficiency83% efficientREVIEW
Transfer Efficiency
83% efficient
83% efficient
Info::
Transfer efficiency: 83%
An estimated 335 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 335 KB of unused JavaScript. This wasted data produces 0.09g of unnecessary CO2 per page view.
Total waste: 335 KB (17% of page weight)
Unused JS 335 KB
0.09g unnecessary CO2 per visit
Actual transfer 1956 KB
Theoretical minimum 1621 KB
Potential savings 335 KB (0.09g 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 32 KB (vs 1956 KB first visit). 118 of 119 resources are served from browser cache, saving 0.53g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.54g)
First visit
1956 KB
Repeat visit
32 KB
98% reduction on repeat visits
Saving 0.53g CO2 per returning visitor
118 resources served from cache · 1 resources re-downloaded
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.