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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
65
GRADE
D
FIX
3
REVIEW
3
PASS
1
INFO
1
Device:
Mobile Desktop
Checks
8
1 PASS 3 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.45g CO2 per view
FIX
1.45g CO2 per view
Warning::
1.45g CO2 per page view
This page transfers 5.1 MB, producing an estimated 1.45g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 0.25g, end-user device 0.93g.
Got: 1.45g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 174.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 174.5 kg of CO2 annually — equivalent to charging 21809 smartphones.

1.45g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 26% of websites

Sustainable Web Design model v4 · Page size: 5.1 MB

Your site
1.45g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.27g
Network
0.25g
End-user device
0.93g
At 10,000 monthly views: Monthly: 14.5 kg · Annual: 174.5 kg · ≈ 21809 smartphone charges
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Not identified✗CDN Squarespace✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
74th percentile
FIX
74th percentile
Warning::
1.45g 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

1.45g

74th percentile

Cleaner than 26% of websites

✗ Above the median website

vs Median 142% more
vs Target 191% more
B
Transfer Efficiency
78% efficient
REVIEW
78% efficient
Info::
Transfer efficiency: 78%
An estimated 1178 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1178 KB of unused JavaScript. This wasted data produces 0.33g of unnecessary CO2 per page view.
78% efficient

Total waste: 1178 KB (22% of page weight)

Unused JS 1178 KB

0.33g unnecessary CO2 per visit

Actual transfer 5257 KB
Theoretical minimum 4078 KB
Potential savings 1178 KB (0.33g 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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 201 KB (vs 5257 KB first visit). 137 of 141 resources are served from browser cache, saving 1.40g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 1.45g)
First visit
5257 KB
Repeat visit
201 KB

96% reduction on repeat visits

Saving 1.40g CO2 per returning visitor

137 resources served from cache · 4 resources re-downloaded

Image Optimization
6 images, 479 KB total, 210 KB wasted
INFO

Image Optimization Audit

Total Images

6

Total Size

479 KB

Oversized

1

Wasted

210 KB

2 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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