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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
60
GRADE
D
FIX
2
REVIEW
3
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 3 REVIEW 2 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 Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Transfer Efficiency
Action
36% efficient
FIX
36% efficient
Critical::
Transfer efficiency: 36%
An estimated 1356 KB (64%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1356 KB of unused JavaScript. This wasted data produces 0.38g of unnecessary CO2 per page view.
36% efficient

Total waste: 1356 KB (64% of page weight)

Unused JS 1356 KB

0.38g unnecessary CO2 per visit

Actual transfer 2129 KB
Theoretical minimum 772 KB
Potential savings 1356 KB (0.38g CO2)

See Deep Analysis sections above for specific optimizations.

B
CO2 Per Page Load
0.59g CO2 per view
REVIEW
0.59g CO2 per view
Info::
0.59g CO2 per page view
This page transfers 2.1 MB, producing an estimated 0.59g 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: 0.59g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 70.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 70.7 kg of CO2 annually — equivalent to charging 8832 smartphones.

0.59g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 52% of websites

Sustainable Web Design model v4 · Page size: 2.1 MB

Your site
0.59g
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: 5.9 kg · Annual: 70.7 kg · ≈ 8832 smartphone charges
B
Carbon Budget
48th percentile
REVIEW
48th percentile
Info::
0.59g CO2 — below the median website (0.60g)
Better than an estimated 52% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 48th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.59g

48th percentile

Cleaner than 52% of websites

✗ Above the median website

vs Median 2% cleaner ✓
vs Target 18% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
90% cached
PASS
90% cached
Info::
90% reduction on repeat visits
Returning visitors download only 207 KB (vs 2129 KB first visit). 56 of 62 resources are served from browser cache, saving 0.53g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 0.59g)
First visit
2129 KB
Repeat visit
207 KB

90% reduction on repeat visits

Saving 0.53g CO2 per returning visitor

56 resources served from cache · 6 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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