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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
71
GRADE
C
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
8
2 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.28g CO2 per view
FIX
1.28g CO2 per view
Warning::
1.28g CO2 per page view
This page transfers 4.5 MB, producing an estimated 1.28g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.24g, network 0.22g, end-user device 0.82g.
Got: 1.28g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 153.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 153.3 kg of CO2 annually — equivalent to charging 19156 smartphones.

1.28g

Carbon Footprint per page view

Above sustainability target (0.50g)

Cleaner than 31% of websites

Sustainable Web Design model v4 · Page size: 4.5 MB

Your site
1.28g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.24g
Network
0.22g
End-user device
0.82g
At 10,000 monthly views: Monthly: 12.8 kg · Annual: 153.3 kg · ≈ 19156 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 ServerCDN Not identified

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
69th percentile
FIX
69th percentile
Warning::
1.28g CO2 — above the median website (0.60g)
Heavier than an estimated 31% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 69th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.28g

69th percentile

Cleaner than 31% of websites

Above the median website

vs Median 113% more
vs Target 155% more
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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 24 KB (vs 4617 KB first visit). 46 of 47 resources are served from browser cache, saving 1.27g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.28g)
First visit
4617 KB
Repeat visit
24 KB

99% reduction on repeat visits

Saving 1.27g CO2 per returning visitor

46 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 210 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 210 KB (5% of page weight)

Unused JS 210 KB

0.06g unnecessary CO2 per visit

Actual transfer 4617 KB
Theoretical minimum 4407 KB
Potential savings 210 KB (0.06g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
5 images, 395 KB total, 2 KB wasted
INFO

Image Optimization Audit

Total Images

5

Total Size

395 KB

Oversized

2

Wasted

2 KB

1 missing alt text 3 missing dimensions 4 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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