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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
1.14g CO2 per view
FIX
1.14g CO2 per view
Warning::
1.14g CO2 per page view
This page transfers 4.0 MB, producing an estimated 1.14g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.21g, network 0.20g, end-user device 0.73g.
Got: 1.14g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 136.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 136.5 kg of CO2 annually — equivalent to charging 17061 smartphones.

1.14g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 35% of websites

Sustainable Web Design model v4 · Page size: 4.0 MB

Your site
1.14g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.21g
Network
0.20g
End-user device
0.73g
At 10,000 monthly views: Monthly: 11.4 kg · Annual: 136.5 kg · ≈ 17061 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
65th percentile
FIX
65th percentile
Warning::
1.14g CO2 — above the median website (0.60g)
Heavier than an estimated 35% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 65th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.14g

65th percentile

Cleaner than 35% of websites

✗ Above the median website

vs Median 90% more
vs Target 127% more
F
Transfer Efficiency
Action
31% efficient
FIX
31% efficient
Critical::
Transfer efficiency: 31%
An estimated 2841 KB (69%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2841 KB of unused JavaScript. This wasted data produces 0.79g of unnecessary CO2 per page view.
31% efficient

Total waste: 2841 KB (69% of page weight)

Unused JS 2841 KB

0.79g unnecessary CO2 per visit

Actual transfer 4112 KB
Theoretical minimum 1271 KB
Potential savings 2841 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
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 311 KB (vs 4112 KB first visit). 169 of 178 resources are served from browser cache, saving 1.05g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 1.14g)
First visit
4112 KB
Repeat visit
311 KB

92% reduction on repeat visits

Saving 1.05g CO2 per returning visitor

169 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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