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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
52
GRADE
F
FIX
4
REVIEW
1
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 1 REVIEW 4 FIX
D
CO2 Per Page Load
Action
1.23g CO2 per view
FIX
1.23g CO2 per view
Warning::
1.23g CO2 per page view
This page transfers 4.4 MB, producing an estimated 1.23g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.23g, network 0.21g, end-user device 0.79g.
Got: 1.23g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 148.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 148.0 kg of CO2 annually — equivalent to charging 18494 smartphones.

1.23g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 32% of websites

Sustainable Web Design model v4 · Page size: 4.4 MB

Your site
1.23g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.23g
Network
0.21g
End-user device
0.79g
At 10,000 monthly views: Monthly: 12.3 kg · Annual: 148.0 kg · ≈ 18494 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 Amazon Web Services✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
68th percentile
FIX
68th percentile
Warning::
1.23g CO2 — above the median website (0.60g)
Heavier than an estimated 32% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 68th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.23g

68th percentile

Cleaner than 32% of websites

✗ Above the median website

vs Median 105% more
vs Target 147% more
F
Transfer Efficiency
Action
36% efficient
FIX
36% efficient
Critical::
Transfer efficiency: 36%
An estimated 2866 KB (64%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2866 KB of unused JavaScript. This wasted data produces 0.79g of unnecessary CO2 per page view.
36% efficient

Total waste: 2866 KB (64% of page weight)

Unused JS 2866 KB

0.79g unnecessary CO2 per visit

Actual transfer 4458 KB
Theoretical minimum 1591 KB
Potential savings 2866 KB (0.79g 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
93% cached
PASS
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 313 KB (vs 4458 KB first visit). 171 of 180 resources are served from browser cache, saving 1.15g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 1.23g)
First visit
4458 KB
Repeat visit
313 KB

93% reduction on repeat visits

Saving 1.15g CO2 per returning visitor

171 resources served from cache · 9 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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