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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
1.51g CO2 per view
FIX
1.51g CO2 per view
Warning::
1.51g CO2 per page view
This page transfers 5.3 MB, producing an estimated 1.51g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.28g, network 0.26g, end-user device 0.97g.
Got: 1.51g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 181.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 181.5 kg of CO2 annually — equivalent to charging 22686 smartphones.

1.51g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 24% of websites

Sustainable Web Design model v4 · Page size: 5.3 MB

Your site
1.51g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.28g
Network
0.26g
End-user device
0.97g
At 10,000 monthly views: Monthly: 15.1 kg · Annual: 181.5 kg · ≈ 22686 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
76th percentile
FIX
76th percentile
Warning::
1.51g CO2 — above the median website (0.60g)
Heavier than an estimated 24% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 76th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.51g

76th percentile

Cleaner than 24% of websites

✗ Above the median website

vs Median 152% more
vs Target 202% 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 295 KB (vs 5468 KB first visit). 159 of 168 resources are served from browser cache, saving 1.43g CO2 per repeat visit.
Info::
Repeat visit: 0.08g CO2 (first visit: 1.51g)
First visit
5468 KB
Repeat visit
295 KB

95% reduction on repeat visits

Saving 1.43g CO2 per returning visitor

159 resources served from cache · 9 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 304 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 304 KB (6% of page weight)

Unused JS 304 KB

0.08g unnecessary CO2 per visit

Actual transfer 5468 KB
Theoretical minimum 5164 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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