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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
50
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
14.56g CO2 per view
FIX
14.56g CO2 per view
Critical::
14.56g CO2 per page view
This page transfers 51.4 MB, producing an estimated 14.56g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 2.70g, network 2.52g, end-user device 9.35g.
Got: 14.56g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 1747.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 1747.2 kg of CO2 annually — equivalent to charging 218398 smartphones.

14.56g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 51.4 MB

Your site
14.56g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
2.70g
Network
2.52g
End-user device
9.35g
At 10,000 monthly views: Monthly: 145.6 kg · Annual: 1747.2 kg · ≈ 218398 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

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
14.56g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

14.56g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 2327% more
vs Target 2812% more
B
Transfer Efficiency
75% efficient
REVIEW
75% efficient
Info::
Transfer efficiency: 75%
An estimated 13026 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 13026 KB of unused JavaScript. This wasted data produces 3.60g of unnecessary CO2 per page view.
75% efficient

Total waste: 13026 KB (25% of page weight)

Unused JS 13026 KB

3.60g unnecessary CO2 per visit

Actual transfer 52645 KB
Theoretical minimum 39619 KB
Potential savings 13026 KB (3.60g 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 54 KB (vs 52645 KB first visit). 106 of 107 resources are served from browser cache, saving 14.54g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 14.56g)
First visit
52645 KB
Repeat visit
54 KB

100% reduction on repeat visits

Saving 14.54g CO2 per returning visitor

106 resources served from cache · 1 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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