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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
53
GRADE
F
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.01g CO2 per view
FIX
2.01g CO2 per view
Critical::
2.01g CO2 per page view
This page transfers 8.5 MB, producing an estimated 2.01g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.42g, end-user device 1.55g.
Got: 2.01g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 241.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 241.5 kg of CO2 annually — equivalent to charging 30189 smartphones.
Info::
Green hosting reduces data center emissions

2.01g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.5 MB

Your site
2.01g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.42g
End-user device
1.55g
At 10,000 monthly views: Monthly: 20.1 kg · Annual: 241.5 kg · ≈ 30189 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.01g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.01g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 235% more
vs Target 303% more
D
Transfer Efficiency
Action
46% efficient
FIX
46% efficient
Critical::
Transfer efficiency: 46%
An estimated 4681 KB (54%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 4681 KB of unused JavaScript. This wasted data produces 1.08g of unnecessary CO2 per page view.
46% efficient

Total waste: 4681 KB (54% of page weight)

Unused JS 4681 KB

1.08g unnecessary CO2 per visit

Actual transfer 8707 KB
Theoretical minimum 4025 KB
Potential savings 4681 KB (1.08g CO2)

See Deep Analysis sections above for specific optimizations.

B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Google Cloud uses renewable energy
Info::
Google Cloud: Verified by the Green Web Foundation
Info::
Google Cloud CDN: Inherits Google Cloud regional renewable mix
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 Google Cloud CDN✗

Google Cloud: Verified by the Green Web Foundation

Google Cloud CDN: Inherits Google Cloud regional renewable mix

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 236 KB (vs 8707 KB first visit). 1020 of 1077 resources are served from browser cache, saving 1.96g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 2.01g)
First visit
8707 KB
Repeat visit
236 KB

97% reduction on repeat visits

Saving 1.96g CO2 per returning visitor

1020 resources served from cache · 57 resources re-downloaded

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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