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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
65
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
2.64g CO2 per view
FIX
2.64g CO2 per view
Critical::
2.64g CO2 per page view
This page transfers 11.2 MB, producing an estimated 2.64g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.55g, end-user device 2.03g.
Got: 2.64g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 317.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 317.1 kg of CO2 annually — equivalent to charging 39632 smartphones.
Info::
Green hosting reduces data center emissions

2.64g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 11.2 MB

Your site
2.64g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.07g
Network
0.55g
End-user device
2.03g
At 10,000 monthly views: Monthly: 26.4 kg · Annual: 317.1 kg · ≈ 39632 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.64g 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

2.64g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 340% more
vs Target 428% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Seravo uses renewable energy
Info::
Seravo: 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 Seravo✓CDN Not identified✗

Seravo: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
93% cached
PASS
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 848 KB (vs 11430 KB first visit). 355 of 387 resources are served from browser cache, saving 2.45g CO2 per repeat visit.
Info::
Repeat visit: 0.20g CO2 (first visit: 2.64g)
First visit
11430 KB
Repeat visit
848 KB

93% reduction on repeat visits

Saving 2.45g CO2 per returning visitor

355 resources served from cache · 32 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 35 KB of potential savings identified. Your page is well-optimized for size.
100% efficient

Total waste: 35 KB (0% of page weight)

Unused JS 35 KB

0.01g unnecessary CO2 per visit

Actual transfer 11430 KB
Theoretical minimum 11395 KB
Potential savings 35 KB (0.01g 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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