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https://cadenaser.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
70
GRADE
C
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
D
CO2 Per Page Load
Action
0.99g CO2 per view
FIX
0.99g CO2 per view
Info::
0.99g CO2 per page view
This page transfers 3.5 MB, producing an estimated 0.99g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.18g, network 0.17g, end-user device 0.63g.
Got: 0.99g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 118.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 118.6 kg of CO2 annually — equivalent to charging 14823 smartphones.

0.99g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 39% of websites

Sustainable Web Design model v4 · Page size: 3.5 MB

Your site
0.99g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.18g
Network
0.17g
End-user device
0.63g
At 10,000 monthly views: Monthly: 9.9 kg · Annual: 118.6 kg · ≈ 14823 smartphone charges
D
Green Hosting
Action
Unknown
FIX
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

D
Carbon Budget
Action
61th percentile
FIX
61th percentile
Warning::
0.99g CO2 — above the median website (0.60g)
Heavier than an estimated 39% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 61th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.99g

61st percentile

Cleaner than 39% of websites

✗ Above the median website

vs Median 65% more
vs Target 98% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 133 KB (vs 3573 KB first visit). 243 of 247 resources are served from browser cache, saving 0.95g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.99g)
First visit
3573 KB
Repeat visit
133 KB

96% reduction on repeat visits

Saving 0.95g CO2 per returning visitor

243 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 217 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 217 KB (6% of page weight)

Unused JS 217 KB

0.06g unnecessary CO2 per visit

Actual transfer 3573 KB
Theoretical minimum 3355 KB
Potential savings 217 KB (0.06g CO2)

See Deep Analysis sections above for specific optimizations.

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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