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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
0.61g CO2 per view
REVIEW
0.61g CO2 per view
Info::
0.61g CO2 per page view
This page transfers 2.2 MB, producing an estimated 0.61g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.11g, end-user device 0.39g.
Got: 0.61g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 73.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 73.7 kg of CO2 annually — equivalent to charging 9218 smartphones.

0.61g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 50% of websites

Sustainable Web Design model v4 · Page size: 2.2 MB

Your site
0.61g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.11g
Network
0.11g
End-user device
0.39g
At 10,000 monthly views: Monthly: 6.1 kg · Annual: 73.7 kg · ≈ 9218 smartphone charges
B
Carbon Budget
50th percentile
REVIEW
50th percentile
Warning::
0.61g CO2 — above the median website (0.60g)
Heavier than an estimated 50% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 50th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.61g

50th percentile

Cleaner than 50% of websites

✗ Above the median website

vs Median 2% more
vs Target 23% more
C
Transfer Efficiency
Action
72% efficient
REVIEW
72% efficient
Warning::
Transfer efficiency: 72%
An estimated 632 KB (28%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 632 KB of unused JavaScript. This wasted data produces 0.18g of unnecessary CO2 per page view.
72% efficient

Total waste: 632 KB (28% of page weight)

Unused JS 632 KB

0.18g unnecessary CO2 per visit

Actual transfer 2222 KB
Theoretical minimum 1589 KB
Potential savings 632 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
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 122 KB (vs 2222 KB first visit). 65 of 66 resources are served from browser cache, saving 0.58g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.61g)
First visit
2222 KB
Repeat visit
122 KB

94% reduction on repeat visits

Saving 0.58g CO2 per returning visitor

65 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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