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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
82
GRADE
B
FIX
0
REVIEW
2
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 REVIEW
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

C
Transfer Efficiency
Action
70% efficient
REVIEW
70% efficient
Warning::
Transfer efficiency: 70%
An estimated 297 KB (30%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 297 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
70% efficient

Total waste: 297 KB (30% of page weight)

Unused JS 297 KB

0.07g unnecessary CO2 per visit

Actual transfer 993 KB
Theoretical minimum 695 KB
Potential savings 297 KB (0.07g CO2)

See Deep Analysis sections above for specific optimizations.

A
CO2 Per Page Load
0.23g CO2 per view
PASS
0.23g CO2 per view
Info::
0.23g CO2 per page view
This page transfers 1.0 MB, producing an estimated 0.23g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.05g, end-user device 0.18g.
Got: 0.23g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 27.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 27.5 kg of CO2 annually — equivalent to charging 3442 smartphones.
Info::
Green hosting reduces data center emissions

0.23g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 88% of websites

Sustainable Web Design model v4 · Page size: 1.0 MB

Your site
0.23g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.05g
End-user device
0.18g
At 10,000 monthly views: Monthly: 2.3 kg · Annual: 27.5 kg · ≈ 3442 smartphone charges
A+
Repeat Visit Weight
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 60 KB (vs 993 KB first visit). 52 of 53 resources are served from browser cache, saving 0.22g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.23g)
First visit
993 KB
Repeat visit
60 KB

94% reduction on repeat visits

Saving 0.22g CO2 per returning visitor

52 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
12th percentile
PASS
12th percentile
Info::
0.23g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 88% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 12th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.23g

12th percentile

Cleaner than 88% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 62% cleaner ✓
vs Target 54% 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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