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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
1.15g CO2 per view
FIX
1.15g CO2 per view
Warning::
1.15g CO2 per page view
This page transfers 4.1 MB, producing an estimated 1.15g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.21g, network 0.20g, end-user device 0.74g.
Got: 1.15g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 137.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 137.8 kg of CO2 annually — equivalent to charging 17220 smartphones.

1.15g

Carbon Footprint per page view

Above sustainability target (0.50g)

Cleaner than 35% of websites

Sustainable Web Design model v4 · Page size: 4.1 MB

Your site
1.15g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.21g
Network
0.20g
End-user device
0.74g
At 10,000 monthly views: Monthly: 11.5 kg · Annual: 137.8 kg · ≈ 17220 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::
Azure: Microsoft is carbon-negative; Azure renewable varies by region
Info::
Azure CDN: Inherits Azure regional renewable mix
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 AzureCDN Azure CDN

Azure: Microsoft is carbon-negative; Azure renewable varies by region

Azure CDN: Inherits Azure regional renewable mix

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
65th percentile
FIX
65th percentile
Warning::
1.15g CO2 — above the median website (0.60g)
Heavier than an estimated 35% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 65th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.15g

65th percentile

Cleaner than 35% of websites

Above the median website

vs Median 91% more
vs Target 130% 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 83 KB (vs 4151 KB first visit). 31 of 32 resources are served from browser cache, saving 1.13g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.15g)
First visit
4151 KB
Repeat visit
83 KB

98% reduction on repeat visits

Saving 1.13g CO2 per returning visitor

31 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 92 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 92 KB (2% of page weight)

Unused JS 92 KB

0.03g unnecessary CO2 per visit

Actual transfer 4151 KB
Theoretical minimum 4058 KB
Potential savings 92 KB (0.03g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
81 images, 3944 KB total, 3903 KB wasted
INFO

Image Optimization Audit

Total Images

81

Total Size

3944 KB

Oversized

21

Wasted

3903 KB

68 missing dimensions 7 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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