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https://www.treccani.it

Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
59
GRADE
D
FIX
3
REVIEW
3
PASS
1
INFO
1
Device:
Mobile Desktop
Checks
8
1 PASS 3 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.29g CO2 per view
FIX
2.29g CO2 per view
Critical::
2.29g CO2 per page view
This page transfers 8.1 MB, producing an estimated 2.29g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.42g, network 0.40g, end-user device 1.47g.
Got: 2.29g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 275.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 275.0 kg of CO2 annually — equivalent to charging 34376 smartphones.

2.29g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.1 MB

Your site
2.29g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.42g
Network
0.40g
End-user device
1.47g
At 10,000 monthly views: Monthly: 22.9 kg · Annual: 275.0 kg · ≈ 34376 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::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 AWS✗CDN AWS CloudFront✗

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.29g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.29g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 282% more
vs Target 358% more
B
Transfer Efficiency
84% efficient
REVIEW
84% efficient
Info::
Transfer efficiency: 84%
An estimated 1298 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1298 KB of unused JavaScript. This wasted data produces 0.36g of unnecessary CO2 per page view.
84% efficient

Total waste: 1298 KB (16% of page weight)

Unused JS 1298 KB

0.36g unnecessary CO2 per visit

Actual transfer 8286 KB
Theoretical minimum 6988 KB
Potential savings 1298 KB (0.36g 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
89% cached
PASS
89% cached
Info::
89% reduction on repeat visits
Returning visitors download only 945 KB (vs 8286 KB first visit). 192 of 194 resources are served from browser cache, saving 2.03g CO2 per repeat visit.
Info::
Repeat visit: 0.26g CO2 (first visit: 2.29g)
First visit
8286 KB
Repeat visit
945 KB

89% reduction on repeat visits

Saving 2.03g CO2 per returning visitor

192 resources served from cache · 2 resources re-downloaded

Image Optimization
71 images, 10 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

71

Total Size

10 KB

Oversized

2

1 missing alt text 70 missing dimensions 68 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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