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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
64
GRADE
D
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
1.97g CO2 per view
FIX
1.97g CO2 per view
Warning::
1.97g CO2 per page view
This page transfers 8.3 MB, producing an estimated 1.97g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.41g, end-user device 1.52g.
Got: 1.97g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 236.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 236.8 kg of CO2 annually — equivalent to charging 29594 smartphones.
Info::
Green hosting reduces data center emissions

1.97g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 11% of websites

Sustainable Web Design model v4 · Page size: 8.3 MB

Your site
1.97g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.41g
End-user device
1.52g
At 10,000 monthly views: Monthly: 19.7 kg · Annual: 236.8 kg · ≈ 29594 smartphone charges
F
Carbon Budget
Action
89th percentile
FIX
89th percentile
Warning::
1.97g CO2 — above the median website (0.60g)
Heavier than an estimated 11% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 89th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.97g

89th percentile

Cleaner than 11% of websites

✗ Above the median website

vs Median 229% more
vs Target 295% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Apache HTTP Server uses renewable energy
Info::
Apache HTTP Server: Verified by the Green Web Foundation
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 Apache HTTP Server✓CDN Not identified✗

Apache HTTP Server: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Transfer Efficiency
83% efficient
REVIEW
83% efficient
Info::
Transfer efficiency: 83%
An estimated 1408 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1408 KB of unused JavaScript. This wasted data produces 0.33g of unnecessary CO2 per page view.
83% efficient

Total waste: 1408 KB (17% of page weight)

Unused JS 1408 KB

0.33g unnecessary CO2 per visit

Actual transfer 8535 KB
Theoretical minimum 7126 KB
Potential savings 1408 KB (0.33g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 197 KB (vs 8535 KB first visit). 150 of 155 resources are served from browser cache, saving 1.93g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 1.97g)
First visit
8535 KB
Repeat visit
197 KB

98% reduction on repeat visits

Saving 1.93g CO2 per returning visitor

150 resources served from cache · 5 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: Hetzner Online GmbH

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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