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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
46
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
3.34g CO2 per view
FIX
3.34g CO2 per view
Critical::
3.34g CO2 per page view
This page transfers 14.1 MB, producing an estimated 3.34g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.69g, end-user device 2.56g.
Got: 3.34g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 400.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 400.7 kg of CO2 annually — equivalent to charging 50082 smartphones.
Info::
Green hosting reduces data center emissions

3.34g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 14.1 MB

Your site
3.34g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.08g
Network
0.69g
End-user device
2.56g
At 10,000 monthly views: Monthly: 33.4 kg · Annual: 400.7 kg · ≈ 50082 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.34g 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

3.34g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 456% more
vs Target 568% more
F
Transfer Efficiency
Action
38% efficient
FIX
38% efficient
Critical::
Transfer efficiency: 38%
An estimated 8942 KB (62%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 8942 KB of unused JavaScript. This wasted data produces 2.07g of unnecessary CO2 per page view.
38% efficient

Total waste: 8942 KB (62% of page weight)

Unused JS 8942 KB

2.07g unnecessary CO2 per visit

Actual transfer 14445 KB
Theoretical minimum 5502 KB
Potential savings 8942 KB (2.07g CO2)

See Deep Analysis sections above for specific optimizations.

B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Amazon Web Services uses renewable energy
Info::
Amazon Web Services: 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 Amazon Web Services✓CDN Google Cloud CDN✗

Amazon Web Services: 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 42 KB (vs 14445 KB first visit). 66 of 67 resources are served from browser cache, saving 3.33g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 3.34g)
First visit
14445 KB
Repeat visit
42 KB

100% reduction on repeat visits

Saving 3.33g CO2 per returning visitor

66 resources served from cache · 1 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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