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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
72
GRADE
C
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.18g CO2 per view
FIX
1.18g CO2 per view
Warning::
1.18g CO2 per page view
This page transfers 5.0 MB, producing an estimated 1.18g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.24g, end-user device 0.91g.
Got: 1.18g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 141.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 141.8 kg of CO2 annually — equivalent to charging 17729 smartphones.
Info::
Green hosting reduces data center emissions

1.18g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 34% of websites

Sustainable Web Design model v4 · Page size: 5.0 MB

Your site
1.18g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.24g
End-user device
0.91g
At 10,000 monthly views: Monthly: 11.8 kg · Annual: 141.8 kg · ≈ 17729 smartphone charges
D
Carbon Budget
Action
66th percentile
FIX
66th percentile
Warning::
1.18g CO2 — above the median website (0.60g)
Heavier than an estimated 34% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 66th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.18g

66th percentile

Cleaner than 34% of websites

✗ Above the median website

vs Median 97% more
vs Target 136% more
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

B
Transfer Efficiency
84% efficient
REVIEW
84% efficient
Info::
Transfer efficiency: 84%
An estimated 827 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 827 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
84% efficient

Total waste: 827 KB (16% of page weight)

Unused JS 827 KB

0.19g unnecessary CO2 per visit

Actual transfer 5113 KB
Theoretical minimum 4286 KB
Potential savings 827 KB (0.19g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 77 KB (vs 5113 KB first visit). 194 of 198 resources are served from browser cache, saving 1.16g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.18g)
First visit
5113 KB
Repeat visit
77 KB

98% reduction on repeat visits

Saving 1.16g CO2 per returning visitor

194 resources served from cache · 4 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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