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https://allaboutbirds.org

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
68
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
1.61g CO2 per view
FIX
1.61g CO2 per view
Warning::
1.61g CO2 per page view
This page transfers 6.8 MB, producing an estimated 1.61g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.33g, end-user device 1.23g.
Got: 1.61g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 192.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 192.7 kg of CO2 annually — equivalent to charging 24090 smartphones.
Info::
Green hosting reduces data center emissions

1.61g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 22% of websites

Sustainable Web Design model v4 · Page size: 6.8 MB

Your site
1.61g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.33g
End-user device
1.23g
At 10,000 monthly views: Monthly: 16.1 kg · Annual: 192.7 kg · ≈ 24090 smartphone charges
F
Carbon Budget
Action
78th percentile
FIX
78th percentile
Warning::
1.61g CO2 — above the median website (0.60g)
Heavier than an estimated 22% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 78th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.61g

78th percentile

Cleaner than 22% of websites

✗ Above the median website

vs Median 168% more
vs Target 221% more
B
Transfer Efficiency
87% efficient
REVIEW
87% efficient
Info::
Transfer efficiency: 87%
An estimated 930 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 930 KB of unused JavaScript. This wasted data produces 0.21g of unnecessary CO2 per page view.
87% efficient

Total waste: 930 KB (13% of page weight)

Unused JS 930 KB

0.21g unnecessary CO2 per visit

Actual transfer 6948 KB
Theoretical minimum 6018 KB
Potential savings 930 KB (0.21g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Hosting✓ Green Hosted
Hosting Cloudflare✓CDN Cloudflare✓

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 36 KB (vs 6948 KB first visit). 218 of 225 resources are served from browser cache, saving 1.60g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.61g)
First visit
6948 KB
Repeat visit
36 KB

99% reduction on repeat visits

Saving 1.60g CO2 per returning visitor

218 resources served from cache · 7 resources re-downloaded

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

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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