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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
76
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.86g CO2 per view
FIX
0.86g CO2 per view
Info::
0.86g CO2 per page view
This page transfers 3.6 MB, producing an estimated 0.86g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.18g, end-user device 0.66g.
Got: 0.86g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 102.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 102.7 kg of CO2 annually — equivalent to charging 12842 smartphones.
Info::
Green hosting reduces data center emissions

0.86g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 43% of websites

Sustainable Web Design model v4 · Page size: 3.6 MB

Your site
0.86g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.18g
End-user device
0.66g
At 10,000 monthly views: Monthly: 8.6 kg · Annual: 102.7 kg · ≈ 12842 smartphone charges
D
Carbon Budget
Action
57th percentile
FIX
57th percentile
Warning::
0.86g CO2 — above the median website (0.60g)
Heavier than an estimated 43% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 57th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.86g

57th percentile

Cleaner than 43% of websites

✗ Above the median website

vs Median 43% more
vs Target 71% 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

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 60 KB (vs 3704 KB first visit). 42 of 43 resources are served from browser cache, saving 0.84g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.86g)
First visit
3704 KB
Repeat visit
60 KB

98% reduction on repeat visits

Saving 0.84g CO2 per returning visitor

42 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 224 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 224 KB (6% of page weight)

Unused JS 224 KB

0.05g unnecessary CO2 per visit

Actual transfer 3704 KB
Theoretical minimum 3479 KB
Potential savings 224 KB (0.05g CO2)

See Deep Analysis sections above for specific optimizations.

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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