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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
75% efficient
REVIEW
75% efficient
Warning::
Transfer efficiency: 75%
An estimated 347 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 347 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.
75% efficient

Total waste: 347 KB (25% of page weight)

Unused JS 347 KB

0.08g unnecessary CO2 per visit

Actual transfer 1381 KB
Theoretical minimum 1034 KB
Potential savings 347 KB (0.08g CO2)

See Deep Analysis sections above for specific optimizations.

A
CO2 Per Page Load
0.32g CO2 per view
PASS
0.32g CO2 per view
Info::
0.32g CO2 per page view
This page transfers 1.3 MB, producing an estimated 0.32g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.25g.
Got: 0.32g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 38.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 38.3 kg of CO2 annually — equivalent to charging 4789 smartphones.
Info::
Green hosting reduces data center emissions

0.32g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 79% of websites

Sustainable Web Design model v4 · Page size: 1.3 MB

Your site
0.32g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.07g
End-user device
0.25g
At 10,000 monthly views: Monthly: 3.2 kg · Annual: 38.3 kg · ≈ 4789 smartphone charges
A+
Repeat Visit Weight
88% cached
PASS
88% cached
Info::
88% reduction on repeat visits
Returning visitors download only 168 KB (vs 1381 KB first visit). 40 of 44 resources are served from browser cache, saving 0.28g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.32g)
First visit
1381 KB
Repeat visit
168 KB

88% reduction on repeat visits

Saving 0.28g CO2 per returning visitor

40 resources served from cache · 4 resources re-downloaded

A
Carbon Budget
21th percentile
PASS
21th percentile
Info::
0.32g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 79% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 21th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.32g

21st percentile

Cleaner than 79% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 47% cleaner ✓
vs Target 36% 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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