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https://fishki.net

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
68
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
1.72g CO2 per view
FIX
1.72g CO2 per view
Warning::
1.72g CO2 per page view
This page transfers 6.1 MB, producing an estimated 1.72g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.32g, network 0.30g, end-user device 1.11g.
Got: 1.72g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 206.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 206.9 kg of CO2 annually — equivalent to charging 25860 smartphones.

1.72g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 18% of websites

Sustainable Web Design model v4 · Page size: 6.1 MB

Your site
1.72g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.32g
Network
0.30g
End-user device
1.11g
At 10,000 monthly views: Monthly: 17.2 kg · Annual: 206.9 kg · ≈ 25860 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 Angie✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
82th percentile
FIX
82th percentile
Warning::
1.72g CO2 — above the median website (0.60g)
Heavier than an estimated 18% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 82th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.72g

82nd percentile

Cleaner than 18% of websites

✗ Above the median website

vs Median 187% more
vs Target 245% 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 140 KB (vs 6233 KB first visit). 373 of 377 resources are served from browser cache, saving 1.69g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 1.72g)
First visit
6233 KB
Repeat visit
140 KB

98% reduction on repeat visits

Saving 1.69g CO2 per returning visitor

373 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 21 KB of potential savings identified. Your page is well-optimized for size.
100% efficient

Total waste: 21 KB (0% of page weight)

Unused JS 21 KB

0.01g unnecessary CO2 per visit

Actual transfer 6233 KB
Theoretical minimum 6212 KB
Potential savings 21 KB (0.01g 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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