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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
74
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 0.39g.
Got: 0.60g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 72.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 72.4 kg of CO2 annually — equivalent to charging 9046 smartphones.

0.60g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 50% 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
0.39g
At 10,000 monthly views: Monthly: 6.0 kg · Annual: 72.4 kg · ≈ 9046 smartphone charges
B
Carbon Budget
50th percentile
REVIEW
50th percentile
Warning::
0.60g 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

0.60g

50th percentile

Cleaner than 50% of websites

✗ Above the median website

vs Median 1% more
vs Target 21% more
B
Transfer Efficiency
83% efficient
REVIEW
83% efficient
Info::
Transfer efficiency: 83%
An estimated 372 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 372 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.
83% efficient

Total waste: 372 KB (17% of page weight)

Unused JS 372 KB

0.10g unnecessary CO2 per visit

Actual transfer 2180 KB
Theoretical minimum 1808 KB
Potential savings 372 KB (0.10g 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
89% cached
PASS
89% cached
Info::
89% reduction on repeat visits
Returning visitors download only 248 KB (vs 2180 KB first visit). 133 of 135 resources are served from browser cache, saving 0.53g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 0.60g)
First visit
2180 KB
Repeat visit
248 KB

89% reduction on repeat visits

Saving 0.53g CO2 per returning visitor

133 resources served from cache · 2 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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