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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
54
GRADE
F
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
5.35g CO2 per view
FIX
5.35g CO2 per view
Critical::
5.35g CO2 per page view
This page transfers 18.9 MB, producing an estimated 5.35g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.99g, network 0.92g, end-user device 3.43g.
Got: 5.35g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 641.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 641.7 kg of CO2 annually — equivalent to charging 80212 smartphones.

5.35g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 18.9 MB

Your site
5.35g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.99g
Network
0.92g
End-user device
3.43g
At 10,000 monthly views: Monthly: 53.5 kg · Annual: 641.7 kg · ≈ 80212 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 Apache HTTP Server✗CDN Varnish✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
5.35g 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

5.35g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 791% more
vs Target 969% 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 426 KB (vs 19335 KB first visit). 422 of 436 resources are served from browser cache, saving 5.23g CO2 per repeat visit.
Info::
Repeat visit: 0.12g CO2 (first visit: 5.35g)
First visit
19335 KB
Repeat visit
426 KB

98% reduction on repeat visits

Saving 5.23g CO2 per returning visitor

422 resources served from cache · 14 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 832 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 832 KB (4% of page weight)

Unused JS 832 KB

0.23g unnecessary CO2 per visit

Actual transfer 19335 KB
Theoretical minimum 18502 KB
Potential savings 832 KB (0.23g 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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