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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
61
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
4.54g CO2 per view
FIX
4.54g CO2 per view
Critical::
4.54g CO2 per page view
This page transfers 16.0 MB, producing an estimated 4.54g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.84g, network 0.78g, end-user device 2.91g.
Got: 4.54g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 544.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 544.6 kg of CO2 annually — equivalent to charging 68075 smartphones.

4.54g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 16.0 MB

Your site
4.54g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.84g
Network
0.78g
End-user device
2.91g
At 10,000 monthly views: Monthly: 45.4 kg · Annual: 544.6 kg · ≈ 68075 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 identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
4.54g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

4.54g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 656% more
vs Target 808% 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 134 KB (vs 16409 KB first visit). 98 of 99 resources are served from browser cache, saving 4.50g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 4.54g)
First visit
16409 KB
Repeat visit
134 KB

99% reduction on repeat visits

Saving 4.50g CO2 per returning visitor

98 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 27 KB of potential savings identified. Your page is well-optimized for size.
100% efficient

Total waste: 27 KB (0% of page weight)

Unused JS 27 KB

0.01g unnecessary CO2 per visit

Actual transfer 16409 KB
Theoretical minimum 16382 KB
Potential savings 27 KB (0.01g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
109 images, 60 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

109

Total Size

60 KB

Oversized

4

81 missing dimensions 54 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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