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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
75
GRADE
C
FIX
3
REVIEW
3
PASS
1
INFO
1
Checks
8
1 PASS 3 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.52g CO2 per view
FIX
1.52g CO2 per view
Warning::
1.52g CO2 per page view
This page transfers 5.4 MB, producing an estimated 1.52g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.28g, network 0.26g, end-user device 0.98g.
Got: 1.52g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 182.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 182.4 kg of CO2 annually — equivalent to charging 22800 smartphones.

1.52g

Carbon Footprint per page view

Above sustainability target (0.50g)

Cleaner than 24% of websites

Sustainable Web Design model v4 · Page size: 5.4 MB

Your site
1.52g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.28g
Network
0.26g
End-user device
0.98g
At 10,000 monthly views: Monthly: 15.2 kg · Annual: 182.4 kg · ≈ 22800 smartphone charges
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identifiedCDN Not identified

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
76th percentile
FIX
76th percentile
Warning::
1.52g CO2 — above the median website (0.60g)
Heavier than an estimated 24% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 76th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.52g

76th percentile

Cleaner than 24% of websites

Above the median website

vs Median 153% more
vs Target 204% more
B
Transfer Efficiency
86% efficient
REVIEW
86% efficient
Info::
Transfer efficiency: 86%
An estimated 794 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 794 KB of unused JavaScript. This wasted data produces 0.22g of unnecessary CO2 per page view.
86% efficient

Total waste: 794 KB (14% of page weight)

Unused JS 794 KB

0.22g unnecessary CO2 per visit

Actual transfer 5496 KB
Theoretical minimum 4701 KB
Potential savings 794 KB (0.22g 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 62 KB (vs 5496 KB first visit). 359 of 362 resources are served from browser cache, saving 1.50g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.52g)
First visit
5496 KB
Repeat visit
62 KB

99% reduction on repeat visits

Saving 1.50g CO2 per returning visitor

359 resources served from cache · 3 resources re-downloaded

Image Optimization
31 images, 98 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

31

Total Size

98 KB

5 missing alt text 24 missing dimensions 5 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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