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https://japantoday.com

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
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.87g CO2 per view
FIX
1.87g CO2 per view
Warning::
1.87g CO2 per page view
This page transfers 6.6 MB, producing an estimated 1.87g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.35g, network 0.32g, end-user device 1.20g.
Got: 1.87g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 224.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 224.8 kg of CO2 annually — equivalent to charging 28099 smartphones.

1.87g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 14% of websites

Sustainable Web Design model v4 · Page size: 6.6 MB

Your site
1.87g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.35g
Network
0.32g
End-user device
1.20g
At 10,000 monthly views: Monthly: 18.7 kg · Annual: 224.8 kg · ≈ 28099 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::
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 Linode/Akamai✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
86th percentile
FIX
86th percentile
Warning::
1.87g CO2 — above the median website (0.60g)
Heavier than an estimated 14% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 86th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.87g

86th percentile

Cleaner than 14% of websites

✗ Above the median website

vs Median 212% more
vs Target 275% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 27 KB (vs 6773 KB first visit). 88 of 89 resources are served from browser cache, saving 1.87g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.87g)
First visit
6773 KB
Repeat visit
27 KB

100% reduction on repeat visits

Saving 1.87g CO2 per returning visitor

88 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 306 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 306 KB (5% of page weight)

Unused JS 306 KB

0.08g unnecessary CO2 per visit

Actual transfer 6773 KB
Theoretical minimum 6467 KB
Potential savings 306 KB (0.08g CO2)

See Deep Analysis sections above for specific optimizations.

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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