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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
65
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.38g CO2 per view
FIX
1.38g CO2 per view
Warning::
1.38g CO2 per page view
This page transfers 4.9 MB, producing an estimated 1.38g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.25g, network 0.24g, end-user device 0.88g.
Got: 1.38g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 165.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 165.2 kg of CO2 annually — equivalent to charging 20652 smartphones.

1.38g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 28% of websites

Sustainable Web Design model v4 · Page size: 4.9 MB

Your site
1.38g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.25g
Network
0.24g
End-user device
0.88g
At 10,000 monthly views: Monthly: 13.8 kg · Annual: 165.2 kg · ≈ 20652 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::
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 Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
72th percentile
FIX
72th percentile
Warning::
1.38g CO2 — above the median website (0.60g)
Heavier than an estimated 28% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 72th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.38g

72nd percentile

Cleaner than 28% of websites

✗ Above the median website

vs Median 129% more
vs Target 175% more
C
Web Font Weight Variants
Action
8 font weights loaded across 1 famil(y/ies)
REVIEW
8 font weights loaded across 1 famil(y/ies)
Warning::
8 font weights loaded -- likely 100+ KB of unused payload
Loading 8 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: Oswald.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
91% cached
PASS
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 472 KB (vs 4978 KB first visit). 117 of 119 resources are served from browser cache, saving 1.25g CO2 per repeat visit.
Info::
Repeat visit: 0.13g CO2 (first visit: 1.38g)
First visit
4978 KB
Repeat visit
472 KB

91% reduction on repeat visits

Saving 1.25g CO2 per returning visitor

117 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 229 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 229 KB (5% of page weight)

Unused JS 229 KB

0.06g unnecessary CO2 per visit

Actual transfer 4978 KB
Theoretical minimum 4749 KB
Potential savings 229 KB (0.06g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
39 images, 602 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

39

Total Size

602 KB

Oversized

1

11 missing alt text 30 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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