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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
4.90g CO2 per view
FIX
4.90g CO2 per view
Critical::
4.90g CO2 per page view
This page transfers 17.3 MB, producing an estimated 4.90g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.91g, network 0.85g, end-user device 3.15g.
Got: 4.90g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 588.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 588.5 kg of CO2 annually — equivalent to charging 73567 smartphones.

4.90g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 17.3 MB

Your site
4.90g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.91g
Network
0.85g
End-user device
3.15g
At 10,000 monthly views: Monthly: 49.0 kg · Annual: 588.5 kg · ≈ 73567 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::
4.90g 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

4.90g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 717% more
vs Target 881% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 17 KB (vs 17733 KB first visit). 115 of 116 resources are served from browser cache, saving 4.90g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 4.90g)
First visit
17733 KB
Repeat visit
17 KB

100% reduction on repeat visits

Saving 4.90g CO2 per returning visitor

115 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 51 KB of potential savings identified. Your page is well-optimized for size.
100% efficient

Total waste: 51 KB (0% of page weight)

Unused JS 51 KB

0.01g unnecessary CO2 per visit

Actual transfer 17733 KB
Theoretical minimum 17681 KB
Potential savings 51 KB (0.01g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
16 images, 1907 KB total, 912 KB wasted
INFO

Image Optimization Audit

Total Images

16

Total Size

1907 KB

Oversized

6

Wasted

912 KB

16 missing dimensions 16 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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