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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
64
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
2.39g CO2 per view
FIX
2.39g CO2 per view
Critical::
2.39g CO2 per page view
This page transfers 8.4 MB, producing an estimated 2.39g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.44g, network 0.41g, end-user device 1.54g.
Got: 2.39g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 287.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 287.0 kg of CO2 annually — equivalent to charging 35880 smartphones.

2.39g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.4 MB

Your site
2.39g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.44g
Network
0.41g
End-user device
1.54g
At 10,000 monthly views: Monthly: 23.9 kg · Annual: 287.0 kg · ≈ 35880 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::
2.39g 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

2.39g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 299% more
vs Target 378% 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 115 KB (vs 8649 KB first visit). 115 of 118 resources are served from browser cache, saving 2.36g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 2.39g)
First visit
8649 KB
Repeat visit
115 KB

99% reduction on repeat visits

Saving 2.36g CO2 per returning visitor

115 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 729 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 729 KB (8% of page weight)

Unused JS 729 KB

0.20g unnecessary CO2 per visit

Actual transfer 8649 KB
Theoretical minimum 7919 KB
Potential savings 729 KB (0.20g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
29 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

29

Total Size

0 KB

Oversized

21

26 missing dimensions 26 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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