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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
68
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.68g CO2 per view
FIX
1.68g CO2 per view
Warning::
1.68g CO2 per page view
This page transfers 5.9 MB, producing an estimated 1.68g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.31g, network 0.29g, end-user device 1.08g.
Got: 1.68g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 201.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 201.2 kg of CO2 annually — equivalent to charging 25149 smartphones.

1.68g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 20% of websites

Sustainable Web Design model v4 · Page size: 5.9 MB

Your site
1.68g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.31g
Network
0.29g
End-user device
1.08g
At 10,000 monthly views: Monthly: 16.8 kg · Annual: 201.2 kg · ≈ 25149 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
80th percentile
FIX
80th percentile
Warning::
1.68g CO2 — above the median website (0.60g)
Heavier than an estimated 20% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 80th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.68g

80th percentile

Cleaner than 20% of websites

✗ Above the median website

vs Median 179% more
vs Target 235% more
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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 29 KB (vs 6062 KB first visit). 47 of 48 resources are served from browser cache, saving 1.67g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.68g)
First visit
6062 KB
Repeat visit
29 KB

100% reduction on repeat visits

Saving 1.67g CO2 per returning visitor

47 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 379 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 379 KB (6% of page weight)

Unused JS 379 KB

0.10g unnecessary CO2 per visit

Actual transfer 6062 KB
Theoretical minimum 5682 KB
Potential savings 379 KB (0.10g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
6 images, 5980 KB total, 4490 KB wasted
INFO

Image Optimization Audit

Total Images

6

Total Size

5980 KB

Oversized

2

Wasted

4490 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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