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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
68
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
1.62g CO2 per view
FIX
1.62g CO2 per view
Warning::
1.62g CO2 per page view
This page transfers 5.7 MB, producing an estimated 1.62g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.30g, network 0.28g, end-user device 1.04g.
Got: 1.62g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 194.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 194.1 kg of CO2 annually — equivalent to charging 24261 smartphones.

1.62g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 21% of websites

Sustainable Web Design model v4 · Page size: 5.7 MB

Your site
1.62g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.30g
Network
0.28g
End-user device
1.04g
At 10,000 monthly views: Monthly: 16.2 kg · Annual: 194.1 kg · ≈ 24261 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
79th percentile
FIX
79th percentile
Warning::
1.62g CO2 — above the median website (0.60g)
Heavier than an estimated 21% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 79th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.62g

79th percentile

Cleaner than 21% of websites

✗ Above the median website

vs Median 170% more
vs Target 223% more
B
Transfer Efficiency
78% efficient
REVIEW
78% efficient
Info::
Transfer efficiency: 78%
An estimated 1278 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1278 KB of unused JavaScript. This wasted data produces 0.35g of unnecessary CO2 per page view.
78% efficient

Total waste: 1278 KB (22% of page weight)

Unused JS 1278 KB

0.35g unnecessary CO2 per visit

Actual transfer 5848 KB
Theoretical minimum 4569 KB
Potential savings 1278 KB (0.35g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 308 KB (vs 5848 KB first visit). 121 of 122 resources are served from browser cache, saving 1.53g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 1.62g)
First visit
5848 KB
Repeat visit
308 KB

95% reduction on repeat visits

Saving 1.53g CO2 per returning visitor

121 resources served from cache · 1 resources re-downloaded

A+
Web Font Weight Variants
3 font weights loaded across 2 famil(y/ies) -- reasonable
PASS
3 font weights loaded across 2 famil(y/ies) -- reasonable
Info::
3 font weight(s) loaded across 2 famil(y/ies)
Image Optimization
14 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

14

Total Size

0 KB

Oversized

5

14 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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