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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
60
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
1.75g CO2 per view
FIX
1.75g CO2 per view
Warning::
1.75g CO2 per page view
This page transfers 6.2 MB, producing an estimated 1.75g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.32g, network 0.30g, end-user device 1.13g.
Got: 1.75g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 210.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 210.6 kg of CO2 annually — equivalent to charging 26324 smartphones.

1.75g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 18% of websites

Sustainable Web Design model v4 · Page size: 6.2 MB

Your site
1.75g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.32g
Network
0.30g
End-user device
1.13g
At 10,000 monthly views: Monthly: 17.5 kg · Annual: 210.6 kg · ≈ 26324 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::
AWS CloudFront: Renewable varies by edge location
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 AWS CloudFront✗

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
82th percentile
FIX
82th percentile
Warning::
1.75g 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

1.75g

82nd percentile

Cleaner than 18% of websites

✗ Above the median website

vs Median 192% more
vs Target 251% 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
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 296 KB (vs 6345 KB first visit). 152 of 161 resources are served from browser cache, saving 1.67g CO2 per repeat visit.
Info::
Repeat visit: 0.08g CO2 (first visit: 1.75g)
First visit
6345 KB
Repeat visit
296 KB

95% reduction on repeat visits

Saving 1.67g CO2 per returning visitor

152 resources served from cache · 9 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 304 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 304 KB (5% of page weight)

Unused JS 304 KB

0.08g unnecessary CO2 per visit

Actual transfer 6345 KB
Theoretical minimum 6041 KB
Potential savings 304 KB (0.08g 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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