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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
75
GRADE
C
FIX
2
REVIEW
3
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 3 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.96g CO2 per view
FIX
0.96g CO2 per view
Info::
0.96g CO2 per page view
This page transfers 4.1 MB, producing an estimated 0.96g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.20g, end-user device 0.74g.
Got: 0.96g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 115.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 115.5 kg of CO2 annually — equivalent to charging 14432 smartphones.
Info::
Green hosting reduces data center emissions

0.96g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 40% of websites

Sustainable Web Design model v4 · Page size: 4.1 MB

Your site
0.96g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.20g
End-user device
0.74g
At 10,000 monthly views: Monthly: 9.6 kg · Annual: 115.5 kg · ≈ 14432 smartphone charges
D
Carbon Budget
Action
60th percentile
FIX
60th percentile
Warning::
0.96g CO2 — above the median website (0.60g)
Heavier than an estimated 40% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 60th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.96g

60th percentile

Cleaner than 40% of websites

✗ Above the median website

vs Median 60% more
vs Target 92% more
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

B
Transfer Efficiency
85% efficient
REVIEW
85% efficient
Info::
Transfer efficiency: 85%
An estimated 607 KB (15%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 607 KB of unused JavaScript. This wasted data produces 0.14g of unnecessary CO2 per page view.
85% efficient

Total waste: 607 KB (15% of page weight)

Unused JS 607 KB

0.14g unnecessary CO2 per visit

Actual transfer 4162 KB
Theoretical minimum 3554 KB
Potential savings 607 KB (0.14g CO2)

See Deep Analysis sections above for specific optimizations.

B
Web Font Weight Variants
No detectable Google Fonts weights
REVIEW
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 77 KB (vs 4162 KB first visit). 166 of 167 resources are served from browser cache, saving 0.94g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.96g)
First visit
4162 KB
Repeat visit
77 KB

98% reduction on repeat visits

Saving 0.94g CO2 per returning visitor

166 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: Cloudflare

Image Optimization
125 images, 212 KB total, 62 KB wasted
INFO

Image Optimization Audit

Total Images

125

Total Size

212 KB

Oversized

1

Wasted

62 KB

44 missing dimensions 1 missing lazy loading
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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