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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
88
GRADE
B
FIX
1
REVIEW
1
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 1 REVIEW 1 FIX
D
Transfer Efficiency
Action
53% efficient
FIX
53% efficient
Warning::
Transfer efficiency: 53%
An estimated 443 KB (47%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 443 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.
53% efficient

Total waste: 443 KB (47% of page weight)

Unused JS 443 KB

0.10g unnecessary CO2 per visit

Actual transfer 946 KB
Theoretical minimum 503 KB
Potential savings 443 KB (0.10g CO2)

See Deep Analysis sections above for specific optimizations.

B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Google Web Server uses renewable energy
Info::
Google Web 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 Google Web Server✓CDN Not identified✗

Google Web Server: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

A
CO2 Per Page Load
0.22g CO2 per view
PASS
0.22g CO2 per view
Info::
0.22g CO2 per page view
This page transfers 0.9 MB, producing an estimated 0.22g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.05g, end-user device 0.17g.
Got: 0.22g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 26.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 26.3 kg of CO2 annually — equivalent to charging 3283 smartphones.
Info::
Green hosting reduces data center emissions

0.22g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 89% of websites

Sustainable Web Design model v4 · Page size: 0.9 MB

Your site
0.22g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.05g
End-user device
0.17g
At 10,000 monthly views: Monthly: 2.2 kg · Annual: 26.3 kg · ≈ 3283 smartphone charges
A+
Repeat Visit Weight
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 76 KB (vs 946 KB first visit). 48 of 49 resources are served from browser cache, saving 0.20g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.22g)
First visit
946 KB
Repeat visit
76 KB

92% reduction on repeat visits

Saving 0.20g CO2 per returning visitor

48 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
11th percentile
PASS
11th percentile
Info::
0.22g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 89% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 11th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.22g

11th percentile

Cleaner than 89% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 64% cleaner ✓
vs Target 56% cleaner ✓
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Google Cloud

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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