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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
0.60g CO2 per view
REVIEW
0.60g CO2 per view
Info::
0.60g CO2 per page view
This page transfers 2.1 MB, producing an estimated 0.60g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.10g, end-user device 0.38g.
Got: 0.60g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 71.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 71.6 kg of CO2 annually — equivalent to charging 8954 smartphones.

0.60g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 51% of websites

Sustainable Web Design model v4 · Page size: 2.1 MB

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

Energy Breakdown

Data center
0.11g
Network
0.10g
End-user device
0.38g
At 10,000 monthly views: Monthly: 6.0 kg · Annual: 71.6 kg · ≈ 8954 smartphone charges
B
Carbon Budget
49th percentile
REVIEW
49th percentile
Info::
0.60g CO2 — below the median website (0.60g)
Better than an estimated 51% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 49th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.60g

49th percentile

Cleaner than 51% of websites

✗ Above the median website

vs Median 1% cleaner ✓
vs Target 19% more
C
Transfer Efficiency
Action
73% efficient
REVIEW
73% efficient
Warning::
Transfer efficiency: 73%
An estimated 582 KB (27%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 582 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.
73% efficient

Total waste: 582 KB (27% of page weight)

Unused JS 582 KB

0.16g unnecessary CO2 per visit

Actual transfer 2158 KB
Theoretical minimum 1576 KB
Potential savings 582 KB (0.16g 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 24 KB (vs 2158 KB first visit). 32 of 33 resources are served from browser cache, saving 0.59g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.60g)
First visit
2158 KB
Repeat visit
24 KB

99% reduction on repeat visits

Saving 0.59g CO2 per returning visitor

32 resources served from cache · 1 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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