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https://ana.co.jp

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
52
GRADE
F
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.95g CO2 per view
FIX
1.95g CO2 per view
Warning::
1.95g CO2 per page view
This page transfers 6.9 MB, producing an estimated 1.95g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.36g, network 0.34g, end-user device 1.25g.
Got: 1.95g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 234.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 234.5 kg of CO2 annually — equivalent to charging 29318 smartphones.

1.95g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 12% of websites

Sustainable Web Design model v4 · Page size: 6.9 MB

Your site
1.95g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.36g
Network
0.34g
End-user device
1.25g
At 10,000 monthly views: Monthly: 19.5 kg · Annual: 234.5 kg · ≈ 29318 smartphone charges
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::
Akamai: Committed to 50% renewable by 2030
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 Not identified✗CDN Akamai✗

Akamai: Committed to 50% renewable by 2030

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
88th percentile
FIX
88th percentile
Warning::
1.95g CO2 — above the median website (0.60g)
Heavier than an estimated 12% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 88th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.95g

88th percentile

Cleaner than 12% of websites

✗ Above the median website

vs Median 226% more
vs Target 291% more
C
Transfer Efficiency
Action
72% efficient
REVIEW
72% efficient
Warning::
Transfer efficiency: 72%
An estimated 1994 KB (28%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1994 KB of unused JavaScript. This wasted data produces 0.55g of unnecessary CO2 per page view.
72% efficient

Total waste: 1994 KB (28% of page weight)

Unused JS 1994 KB

0.55g unnecessary CO2 per visit

Actual transfer 7067 KB
Theoretical minimum 5073 KB
Potential savings 1994 KB (0.55g 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 86 KB (vs 7067 KB first visit). 652 of 660 resources are served from browser cache, saving 1.93g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.95g)
First visit
7067 KB
Repeat visit
86 KB

99% reduction on repeat visits

Saving 1.93g CO2 per returning visitor

652 resources served from cache · 8 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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