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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
52
GRADE
F
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
4.18g CO2 per view
FIX
4.18g CO2 per view
Critical::
4.18g CO2 per page view
This page transfers 14.8 MB, producing an estimated 4.18g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.77g, network 0.72g, end-user device 2.69g.
Got: 4.18g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 501.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 501.9 kg of CO2 annually — equivalent to charging 62737 smartphones.

4.18g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 14.8 MB

Your site
4.18g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.77g
Network
0.72g
End-user device
2.69g
At 10,000 monthly views: Monthly: 41.8 kg · Annual: 501.9 kg · ≈ 62737 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::
4.18g 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

4.18g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 597% more
vs Target 737% more
B
Transfer Efficiency
85% efficient
REVIEW
85% efficient
Info::
Transfer efficiency: 85%
An estimated 2228 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2228 KB of unused JavaScript. This wasted data produces 0.62g of unnecessary CO2 per page view.
85% efficient

Total waste: 2228 KB (15% of page weight)

Unused JS 2228 KB

0.62g unnecessary CO2 per visit

Actual transfer 15123 KB
Theoretical minimum 12894 KB
Potential savings 2228 KB (0.62g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 399 KB (vs 15123 KB first visit). 422 of 439 resources are served from browser cache, saving 4.07g CO2 per repeat visit.
Info::
Repeat visit: 0.11g CO2 (first visit: 4.18g)
First visit
15123 KB
Repeat visit
399 KB

97% reduction on repeat visits

Saving 4.07g CO2 per returning visitor

422 resources served from cache · 17 resources re-downloaded

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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