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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
54
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
1.58g CO2 per view
FIX
1.58g CO2 per view
Warning::
1.58g CO2 per page view
This page transfers 5.6 MB, producing an estimated 1.58g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.29g, network 0.27g, end-user device 1.01g.
Got: 1.58g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 189.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 189.1 kg of CO2 annually — equivalent to charging 23639 smartphones.

1.58g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 23% of websites

Sustainable Web Design model v4 · Page size: 5.6 MB

Your site
1.58g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.29g
Network
0.27g
End-user device
1.01g
At 10,000 monthly views: Monthly: 15.8 kg · Annual: 189.1 kg · ≈ 23639 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
77th percentile
FIX
77th percentile
Warning::
1.58g CO2 — above the median website (0.60g)
Heavier than an estimated 23% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 77th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.58g

77th percentile

Cleaner than 23% of websites

✗ Above the median website

vs Median 163% more
vs Target 215% more
C
Transfer Efficiency
Action
62% efficient
REVIEW
62% efficient
Warning::
Transfer efficiency: 62%
An estimated 2152 KB (38%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2152 KB of unused JavaScript. This wasted data produces 0.60g of unnecessary CO2 per page view.
62% efficient

Total waste: 2152 KB (38% of page weight)

Unused JS 2152 KB

0.60g unnecessary CO2 per visit

Actual transfer 5698 KB
Theoretical minimum 3546 KB
Potential savings 2152 KB (0.60g 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
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 216 KB (vs 5698 KB first visit). 145 of 150 resources are served from browser cache, saving 1.52g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 1.58g)
First visit
5698 KB
Repeat visit
216 KB

96% reduction on repeat visits

Saving 1.52g CO2 per returning visitor

145 resources served from cache · 5 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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