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Sustainability

· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
78
GRADE
C
FIX
1
REVIEW
3
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
7
3 PASS 3 REVIEW 1 FIX
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 Express✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

C
Transfer Efficiency
Action
60% efficient
REVIEW
60% efficient
Warning::
Transfer efficiency: 60%
An estimated 124 KB (40%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 124 KB of unused JavaScript. This wasted data produces 0.03g of unnecessary CO2 per page view.
60% efficient

Total waste: 124 KB (40% of page weight)

Unused JS 124 KB

0.03g unnecessary CO2 per visit

Actual transfer 312 KB
Theoretical minimum 188 KB
Potential savings 124 KB (0.03g CO2)

See Deep Analysis sections above for specific optimizations.

C
Web Font Weight Variants
Action
28 font weights loaded across 9 famil(y/ies)
REVIEW
28 font weights loaded across 9 famil(y/ies)
Warning::
28 font weights loaded -- likely 100+ KB of unused payload
Loading 28 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Amiri, Cinzel, Gulzar, Hind Siliguri, Noto Nastaliq Urdu, Noto Serif Bengali, Noto Serif Devanagari, Playfair Display, Plus Jakarta Sans.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
CO2 Per Page Load
0.09g CO2 per view
PASS
0.09g CO2 per view
Info::
0.09g CO2 per page view
This page transfers 0.3 MB, producing an estimated 0.09g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.01g, end-user device 0.06g.
Got: 0.09g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 10.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 10.4 kg of CO2 annually — equivalent to charging 1297 smartphones.

0.09g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.3 MB

Your site
0.09g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.01g
End-user device
0.06g
At 10,000 monthly views: Monthly: 0.9 kg · Annual: 10.4 kg · ≈ 1297 smartphone charges
A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 2 KB (vs 312 KB first visit). 15 of 16 resources are served from browser cache, saving 0.09g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.09g)
First visit
312 KB
Repeat visit
2 KB

99% reduction on repeat visits

Saving 0.09g CO2 per returning visitor

15 resources served from cache · 1 resources re-downloaded

A+
Carbon Budget
10th percentile
PASS
10th percentile
Info::
0.09g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.09g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 86% cleaner ✓
vs Target 83% cleaner ✓
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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