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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
82
GRADE
B
FIX
0
REVIEW
5
PASS
2
INFO
1
Checks
8
2 PASS 5 REVIEW
B
CO2 Per Page Load
0.55g CO2 per view
REVIEW
0.55g CO2 per view
Info::
0.55g CO2 per page view
This page transfers 2.3 MB, producing an estimated 0.55g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.11g, end-user device 0.42g.
Got: 0.55g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 65.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 65.7 kg of CO2 annually — equivalent to charging 8215 smartphones.
Info::
Green hosting reduces data center emissions

0.55g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 56% of websites

Sustainable Web Design model v4 · Page size: 2.3 MB

Your site
0.55g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.11g
End-user device
0.42g
At 10,000 monthly views: Monthly: 5.5 kg · Annual: 65.7 kg · ≈ 8215 smartphone charges
B
Carbon Budget
44th percentile
REVIEW
44th percentile
Info::
0.55g CO2 — below the median website (0.60g)
Better than an estimated 56% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 44th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.55g

44th percentile

Cleaner than 56% of websites

✗ Above the median website

vs Median 9% cleaner ✓
vs Target 10% more
B
Transfer Efficiency
84% efficient
REVIEW
84% efficient
Info::
Transfer efficiency: 84%
An estimated 386 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 386 KB of unused JavaScript. This wasted data produces 0.09g of unnecessary CO2 per page view.
84% efficient

Total waste: 386 KB (16% of page weight)

Unused JS 386 KB

0.09g unnecessary CO2 per visit

Actual transfer 2369 KB
Theoretical minimum 1982 KB
Potential savings 386 KB (0.09g 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
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Netlify CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Netlify: Hosted on AWS/Google Cloud with renewable energy matching
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 Not identified✗CDN Netlify✓

Netlify: Hosted on AWS/Google Cloud with renewable energy matching

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 133 KB (vs 2369 KB first visit). 111 of 119 resources are served from browser cache, saving 0.52g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.55g)
First visit
2369 KB
Repeat visit
133 KB

94% reduction on repeat visits

Saving 0.52g CO2 per returning visitor

111 resources served from cache · 8 resources re-downloaded

Image Optimization
5 images, 298 KB total, 148 KB wasted
INFO

Image Optimization Audit

Total Images

5

Total Size

298 KB

Oversized

1

Wasted

148 KB

5 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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