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https://tangerine-gnome-a0d2e8.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
0.97g CO2 per view
FIX
0.97g CO2 per view
Info::
0.97g CO2 per page view
This page transfers 4.1 MB, producing an estimated 0.97g 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: 0.97g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 116.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 116.3 kg of CO2 annually — equivalent to charging 14534 smartphones.
Info::
Green hosting reduces data center emissions

0.97g

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
0.97g
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: 9.7 kg · Annual: 116.3 kg · ≈ 14534 smartphone charges
D
Carbon Budget
Action
60th percentile
FIX
60th percentile
Warning::
0.97g 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

0.97g

60th percentile

Cleaner than 40% of websites

✗ Above the median website

vs Median 61% more
vs Target 94% more
F
Transfer Efficiency
Action
38% efficient
FIX
38% efficient
Critical::
Transfer efficiency: 38%
An estimated 2583 KB (62%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2583 KB of unused JavaScript. This wasted data produces 0.60g of unnecessary CO2 per page view.
38% efficient

Total waste: 2583 KB (62% of page weight)

Unused JS 2583 KB

0.60g unnecessary CO2 per visit

Actual transfer 4192 KB
Theoretical minimum 1608 KB
Potential savings 2583 KB (0.60g 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 4192 KB first visit). 115 of 121 resources are served from browser cache, saving 0.96g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.97g)
First visit
4192 KB
Repeat visit
39 KB

99% reduction on repeat visits

Saving 0.96g CO2 per returning visitor

115 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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