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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
2.12g CO2 per view
FIX
2.12g CO2 per view
Critical::
2.12g CO2 per page view
This page transfers 8.9 MB, producing an estimated 2.12g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.44g, end-user device 1.63g.
Got: 2.12g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 254.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 254.1 kg of CO2 annually — equivalent to charging 31765 smartphones.
Info::
Green hosting reduces data center emissions

2.12g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.9 MB

Your site
2.12g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.44g
End-user device
1.63g
At 10,000 monthly views: Monthly: 21.2 kg · Annual: 254.1 kg · ≈ 31765 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.12g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.12g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 253% more
vs Target 324% 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
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 1053 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1053 KB of unused JavaScript. This wasted data produces 0.24g of unnecessary CO2 per page view.
89% efficient

Total waste: 1053 KB (11% of page weight)

Unused JS 1053 KB

0.24g unnecessary CO2 per visit

Actual transfer 9161 KB
Theoretical minimum 8108 KB
Potential savings 1053 KB (0.24g 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 169 KB (vs 9161 KB first visit). 147 of 151 resources are served from browser cache, saving 2.08g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 2.12g)
First visit
9161 KB
Repeat visit
169 KB

98% reduction on repeat visits

Saving 2.08g CO2 per returning visitor

147 resources served from cache · 4 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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