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https://thebirdkc.com

Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
63
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.70g CO2 per view
FIX
1.70g CO2 per view
Warning::
1.70g CO2 per page view
This page transfers 6.0 MB, producing an estimated 1.70g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.32g, network 0.29g, end-user device 1.09g.
Got: 1.70g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 204.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 204.4 kg of CO2 annually — equivalent to charging 25555 smartphones.

1.70g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 19% of websites

Sustainable Web Design model v4 · Page size: 6.0 MB

Your site
1.70g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.32g
Network
0.29g
End-user device
1.09g
At 10,000 monthly views: Monthly: 17.0 kg · Annual: 204.4 kg · ≈ 25555 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 Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
81th percentile
FIX
81th percentile
Warning::
1.70g CO2 — above the median website (0.60g)
Heavier than an estimated 19% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 81th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.70g

81st percentile

Cleaner than 19% of websites

✗ Above the median website

vs Median 184% more
vs Target 241% more
B
Transfer Efficiency
86% efficient
REVIEW
86% efficient
Info::
Transfer efficiency: 86%
An estimated 893 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 893 KB of unused JavaScript. This wasted data produces 0.25g of unnecessary CO2 per page view.
86% efficient

Total waste: 893 KB (14% of page weight)

Unused JS 893 KB

0.25g unnecessary CO2 per visit

Actual transfer 6160 KB
Theoretical minimum 5267 KB
Potential savings 893 KB (0.25g 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
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 374 KB (vs 6160 KB first visit). 199 of 205 resources are served from browser cache, saving 1.60g CO2 per repeat visit.
Info::
Repeat visit: 0.10g CO2 (first visit: 1.70g)
First visit
6160 KB
Repeat visit
374 KB

94% reduction on repeat visits

Saving 1.60g CO2 per returning visitor

199 resources served from cache · 6 resources re-downloaded

A+
Web Font Weight Variants
2 font weights loaded across 2 famil(y/ies) -- reasonable
PASS
2 font weights loaded across 2 famil(y/ies) -- reasonable
Info::
2 font weight(s) loaded across 2 famil(y/ies)
Image Optimization
21 images, 397 KB total, 74 KB wasted
INFO

Image Optimization Audit

Total Images

21

Total Size

397 KB

Oversized

1

Wasted

74 KB

19 missing alt text 19 missing lazy loading
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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