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https://astonishing-marigold-c4563e.netlify.app

Sustainability

· 7 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
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
7
2 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.16g CO2 per view
FIX
1.16g CO2 per view
Warning::
1.16g CO2 per page view
This page transfers 4.9 MB, producing an estimated 1.16g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.24g, end-user device 0.89g.
Got: 1.16g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 139.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 139.6 kg of CO2 annually — equivalent to charging 17454 smartphones.
Info::
Green hosting reduces data center emissions

1.16g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 34% of websites

Sustainable Web Design model v4 · Page size: 4.9 MB

Your site
1.16g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.24g
End-user device
0.89g
At 10,000 monthly views: Monthly: 11.6 kg · Annual: 139.6 kg · ≈ 17454 smartphone charges
D
Carbon Budget
Action
66th percentile
FIX
66th percentile
Warning::
1.16g CO2 — above the median website (0.60g)
Heavier than an estimated 34% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 66th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.16g

66th percentile

Cleaner than 34% of websites

✗ Above the median website

vs Median 94% more
vs Target 133% more
F
Transfer Efficiency
Action
31% efficient
FIX
31% efficient
Critical::
Transfer efficiency: 31%
An estimated 3492 KB (69%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 3492 KB of unused JavaScript. This wasted data produces 0.81g of unnecessary CO2 per page view.
31% efficient

Total waste: 3492 KB (69% of page weight)

Unused JS 3492 KB

0.81g unnecessary CO2 per visit

Actual transfer 5034 KB
Theoretical minimum 1541 KB
Potential savings 3492 KB (0.81g 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 39 KB (vs 5034 KB first visit). 123 of 129 resources are served from browser cache, saving 1.15g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.16g)
First visit
5034 KB
Repeat visit
39 KB

99% reduction on repeat visits

Saving 1.15g CO2 per returning visitor

123 resources served from cache · 6 resources re-downloaded

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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