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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
62
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
7.36g CO2 per view
FIX
7.36g CO2 per view
Critical::
7.36g CO2 per page view
This page transfers 31.1 MB, producing an estimated 7.36g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.18g, network 1.52g, end-user device 5.65g.
Got: 7.36g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 883.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 883.4 kg of CO2 annually — equivalent to charging 110421 smartphones.
Info::
Green hosting reduces data center emissions

7.36g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 31.1 MB

Your site
7.36g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.18g
Network
1.52g
End-user device
5.65g
At 10,000 monthly views: Monthly: 73.6 kg · Annual: 883.4 kg · ≈ 110421 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
7.36g 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

7.36g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 1127% more
vs Target 1372% 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

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 39 KB (vs 31848 KB first visit). 121 of 122 resources are served from browser cache, saving 7.35g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 7.36g)
First visit
31848 KB
Repeat visit
39 KB

100% reduction on repeat visits

Saving 7.35g CO2 per returning visitor

121 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 73 KB of potential savings identified. Your page is well-optimized for size.
100% efficient

Total waste: 73 KB (0% of page weight)

Unused JS 73 KB

0.02g unnecessary CO2 per visit

Actual transfer 31848 KB
Theoretical minimum 31775 KB
Potential savings 73 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

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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