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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 Cloud uses renewable energy
Info::
Google Cloud: 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 Cloud✓CDN Not identified✗

Google Cloud: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

C
Transfer Efficiency
Action
73% efficient
REVIEW
73% efficient
Warning::
Transfer efficiency: 73%
An estimated 443 KB (27%) 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.
73% efficient

Total waste: 443 KB (27% of page weight)

Unused JS 443 KB

0.10g unnecessary CO2 per visit

Actual transfer 1672 KB
Theoretical minimum 1229 KB
Potential savings 443 KB (0.10g CO2)

See Deep Analysis sections above for specific optimizations.

A
CO2 Per Page Load
0.39g CO2 per view
PASS
0.39g CO2 per view
Info::
0.39g CO2 per page view
This page transfers 1.6 MB, producing an estimated 0.39g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.30g.
Got: 0.39g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 46.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 46.4 kg of CO2 annually — equivalent to charging 5799 smartphones.
Info::
Green hosting reduces data center emissions

0.39g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 72% of websites

Sustainable Web Design model v4 · Page size: 1.6 MB

Your site
0.39g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.08g
End-user device
0.30g
At 10,000 monthly views: Monthly: 3.9 kg · Annual: 46.4 kg · ≈ 5799 smartphone charges
A+
Repeat Visit Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 55 KB (vs 1672 KB first visit). 104 of 108 resources are served from browser cache, saving 0.37g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.39g)
First visit
1672 KB
Repeat visit
55 KB

97% reduction on repeat visits

Saving 0.37g CO2 per returning visitor

104 resources served from cache · 4 resources re-downloaded

A
Carbon Budget
28th percentile
PASS
28th percentile
Info::
0.39g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 72% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 28th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.39g

28th percentile

Cleaner than 72% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 36% cleaner ✓
vs Target 23% 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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