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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
60
GRADE
D
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
1.46g CO2 per view
FIX
1.46g CO2 per view
Warning::
1.46g CO2 per page view
This page transfers 6.2 MB, producing an estimated 1.46g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.30g, end-user device 1.12g.
Got: 1.46g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 175.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 175.6 kg of CO2 annually — equivalent to charging 21953 smartphones.
Info::
Green hosting reduces data center emissions

1.46g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 26% of websites

Sustainable Web Design model v4 · Page size: 6.2 MB

Your site
1.46g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.30g
End-user device
1.12g
At 10,000 monthly views: Monthly: 14.6 kg · Annual: 175.6 kg · ≈ 21953 smartphone charges
F
Carbon Budget
Action
74th percentile
FIX
74th percentile
Warning::
1.46g CO2 — above the median website (0.60g)
Heavier than an estimated 26% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 74th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.46g

74th percentile

Cleaner than 26% of websites

✗ Above the median website

vs Median 144% more
vs Target 193% 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

C
Transfer Efficiency
Action
67% efficient
REVIEW
67% efficient
Warning::
Transfer efficiency: 67%
An estimated 2096 KB (33%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2096 KB of unused JavaScript. This wasted data produces 0.48g of unnecessary CO2 per page view.
67% efficient

Total waste: 2096 KB (33% of page weight)

Unused JS 2096 KB

0.48g unnecessary CO2 per visit

Actual transfer 6331 KB
Theoretical minimum 4235 KB
Potential savings 2096 KB (0.48g 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 126 KB (vs 6331 KB first visit). 323 of 333 resources are served from browser cache, saving 1.43g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.46g)
First visit
6331 KB
Repeat visit
126 KB

98% reduction on repeat visits

Saving 1.43g CO2 per returning visitor

323 resources served from cache · 10 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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