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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
62
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
3.85g CO2 per view
FIX
3.85g CO2 per view
Critical::
3.85g CO2 per page view
This page transfers 16.3 MB, producing an estimated 3.85g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.80g, end-user device 2.96g.
Got: 3.85g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 462.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 462.1 kg of CO2 annually — equivalent to charging 57765 smartphones.
Info::
Green hosting reduces data center emissions

3.85g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 16.3 MB

Your site
3.85g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.10g
Network
0.80g
End-user device
2.96g
At 10,000 monthly views: Monthly: 38.5 kg · Annual: 462.1 kg · ≈ 57765 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.85g 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

3.85g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 542% more
vs Target 670% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 25 KB (vs 16661 KB first visit). 171 of 174 resources are served from browser cache, saving 3.85g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 3.85g)
First visit
16661 KB
Repeat visit
25 KB

100% reduction on repeat visits

Saving 3.85g CO2 per returning visitor

171 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 1297 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 1297 KB (8% of page weight)

Unused JS 1297 KB

0.30g unnecessary CO2 per visit

Actual transfer 16661 KB
Theoretical minimum 15363 KB
Potential savings 1297 KB (0.30g 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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