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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
3
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 3 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

B
Repeat Visit Weight
73% cached
REVIEW
73% cached
Info::
73% reduction on repeat visits
Returning visitors download only 245 KB (vs 916 KB first visit). 191 of 193 resources are served from browser cache, saving 0.16g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 0.21g)
First visit
916 KB
Repeat visit
245 KB

73% reduction on repeat visits

Saving 0.16g CO2 per returning visitor

191 resources served from cache · 2 resources re-downloaded

B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 99 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 99 KB of unused JavaScript. This wasted data produces 0.02g of unnecessary CO2 per page view.
89% efficient

Total waste: 99 KB (11% of page weight)

Unused JS 99 KB

0.02g unnecessary CO2 per visit

Actual transfer 916 KB
Theoretical minimum 816 KB
Potential savings 99 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

A
CO2 Per Page Load
0.21g CO2 per view
PASS
0.21g CO2 per view
Info::
0.21g CO2 per page view
This page transfers 0.9 MB, producing an estimated 0.21g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.04g, end-user device 0.16g.
Got: 0.21g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 25.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 25.4 kg of CO2 annually — equivalent to charging 3176 smartphones.
Info::
Green hosting reduces data center emissions

0.21g

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
0.21g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.04g
End-user device
0.16g
At 10,000 monthly views: Monthly: 2.1 kg · Annual: 25.4 kg · ≈ 3176 smartphone charges
A
Carbon Budget
11th percentile
PASS
11th percentile
Info::
0.21g 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

0.21g

11th percentile

Cleaner than 89% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 65% cleaner ✓
vs Target 58% 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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