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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
65
GRADE
D
FIX
3
REVIEW
1
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.86g CO2 per view
FIX
2.86g CO2 per view
Critical::
2.86g CO2 per page view
This page transfers 10.1 MB, producing an estimated 2.86g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.53g, network 0.49g, end-user device 1.83g.
Got: 2.86g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 342.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 342.9 kg of CO2 annually — equivalent to charging 42863 smartphones.

2.86g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 10.1 MB

Your site
2.86g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.53g
Network
0.49g
End-user device
1.83g
At 10,000 monthly views: Monthly: 28.6 kg · Annual: 342.9 kg · ≈ 42863 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::
2.86g 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

2.86g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 376% more
vs Target 472% more
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 79 KB (vs 10332 KB first visit). 139 of 140 resources are served from browser cache, saving 2.84g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.86g)
First visit
10332 KB
Repeat visit
79 KB

99% reduction on repeat visits

Saving 2.84g CO2 per returning visitor

139 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 396 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 396 KB (4% of page weight)

Unused JS 396 KB

0.11g unnecessary CO2 per visit

Actual transfer 10332 KB
Theoretical minimum 9936 KB
Potential savings 396 KB (0.11g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Web Font Weight Variants
1 font weights loaded across 1 famil(y/ies) -- reasonable
PASS
1 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
1 font weight(s) loaded across 1 famil(y/ies)
Image Optimization
29 images, 214 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

29

Total Size

214 KB

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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