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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
70
GRADE
C
FIX
1
REVIEW
4
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 4 REVIEW 1 FIX
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

B
CO2 Per Page Load
0.53g CO2 per view
REVIEW
0.53g CO2 per view
Info::
0.53g CO2 per page view
This page transfers 1.9 MB, producing an estimated 0.53g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.09g, end-user device 0.34g.
Got: 0.53g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 63.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 63.2 kg of CO2 annually — equivalent to charging 7899 smartphones.

0.53g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 58% of websites

Sustainable Web Design model v4 · Page size: 1.9 MB

Your site
0.53g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.10g
Network
0.09g
End-user device
0.34g
At 10,000 monthly views: Monthly: 5.3 kg · Annual: 63.2 kg · ≈ 7899 smartphone charges
B
Carbon Budget
42th percentile
REVIEW
42th percentile
Info::
0.53g CO2 — below the median website (0.60g)
Better than an estimated 58% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 42th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.53g

42nd percentile

Cleaner than 58% of websites

✗ Above the median website

vs Median 12% cleaner ✓
vs Target 5% more
C
Transfer Efficiency
Action
66% efficient
REVIEW
66% efficient
Warning::
Transfer efficiency: 66%
An estimated 656 KB (34%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 656 KB of unused JavaScript. This wasted data produces 0.18g of unnecessary CO2 per page view.
66% efficient

Total waste: 656 KB (34% of page weight)

Unused JS 656 KB

0.18g unnecessary CO2 per visit

Actual transfer 1904 KB
Theoretical minimum 1248 KB
Potential savings 656 KB (0.18g 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 59 KB (vs 1904 KB first visit). 105 of 108 resources are served from browser cache, saving 0.51g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.53g)
First visit
1904 KB
Repeat visit
59 KB

97% reduction on repeat visits

Saving 0.51g CO2 per returning visitor

105 resources served from cache · 3 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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