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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
75
GRADE
C
FIX
1
REVIEW
3
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 3 REVIEW 1 FIX
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Amazon Web Services✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Carbon Budget
35th percentile
REVIEW
35th percentile
Info::
0.45g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 65% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 35th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.45g

35th percentile

Cleaner than 65% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 25% cleaner ✓
vs Target 10% cleaner ✓
B
Transfer Efficiency
83% efficient
REVIEW
83% efficient
Info::
Transfer efficiency: 83%
An estimated 272 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 272 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.
83% efficient

Total waste: 272 KB (17% of page weight)

Unused JS 272 KB

0.08g unnecessary CO2 per visit

Actual transfer 1634 KB
Theoretical minimum 1362 KB
Potential savings 272 KB (0.08g 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
CO2 Per Page Load
0.45g CO2 per view
PASS
0.45g CO2 per view
Info::
0.45g CO2 per page view
This page transfers 1.6 MB, producing an estimated 0.45g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.08g, end-user device 0.29g.
Got: 0.45g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 54.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 54.2 kg of CO2 annually — equivalent to charging 6780 smartphones.

0.45g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 65% of websites

Sustainable Web Design model v4 · Page size: 1.6 MB

Your site
0.45g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.08g
Network
0.08g
End-user device
0.29g
At 10,000 monthly views: Monthly: 4.5 kg · Annual: 54.2 kg · ≈ 6780 smartphone charges
A+
Repeat Visit Weight
93% cached
PASS
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 117 KB (vs 1634 KB first visit). 116 of 118 resources are served from browser cache, saving 0.42g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.45g)
First visit
1634 KB
Repeat visit
117 KB

93% reduction on repeat visits

Saving 0.42g CO2 per returning visitor

116 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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