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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
56
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
39.06g CO2 per view
FIX
39.06g CO2 per view
Critical::
39.06g CO2 per page view
This page transfers 137.9 MB, producing an estimated 39.06g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 7.23g, network 6.75g, end-user device 25.07g.
Got: 39.06g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 4686.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 4686.6 kg of CO2 annually — equivalent to charging 585828 smartphones.

39.06g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 137.9 MB

Your site
39.06g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
7.23g
Network
6.75g
End-user device
25.07g
At 10,000 monthly views: Monthly: 390.6 kg · Annual: 4686.6 kg · ≈ 585828 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

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
39.06g 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

39.06g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 6409% more
vs Target 7711% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 153 KB (vs 141216 KB first visit). 292 of 296 resources are served from browser cache, saving 39.01g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 39.06g)
First visit
141216 KB
Repeat visit
153 KB

100% reduction on repeat visits

Saving 39.01g CO2 per returning visitor

292 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
99% efficient
PASS
99% efficient
Info::
Transfer efficiency: 99%
Only 1748 KB of potential savings identified. Your page is well-optimized for size.
99% efficient

Total waste: 1748 KB (1% of page weight)

Unused JS 1748 KB

0.48g unnecessary CO2 per visit

Actual transfer 141216 KB
Theoretical minimum 139468 KB
Potential savings 1748 KB (0.48g 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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