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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
1
PASS
3
INFO
1
Checks
8
3 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.00g CO2 per view
FIX
2.00g CO2 per view
Warning::
2.00g CO2 per page view
This page transfers 7.0 MB, producing an estimated 2.00g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.37g, network 0.34g, end-user device 1.28g.
Got: 2.00g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 239.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 239.4 kg of CO2 annually — equivalent to charging 29929 smartphones.

2.00g

Carbon Footprint per page view

Above sustainability target (0.50g)

Cleaner than 11% of websites

Sustainable Web Design model v4 · Page size: 7.0 MB

Your site
2.00g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.37g
Network
0.34g
End-user device
1.28g
At 10,000 monthly views: Monthly: 20.0 kg · Annual: 239.4 kg · ≈ 29929 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 identifiedCDN Not identified

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
89th percentile
FIX
89th percentile
Warning::
2.00g CO2 — above the median website (0.60g)
Heavier than an estimated 11% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 89th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.00g

89th percentile

Cleaner than 11% of websites

Above the median website

vs Median 233% more
vs Target 299% 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 55 KB (vs 7214 KB first visit). 77 of 78 resources are served from browser cache, saving 1.98g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.00g)
First visit
7214 KB
Repeat visit
55 KB

99% reduction on repeat visits

Saving 1.98g CO2 per returning visitor

77 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 440 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 440 KB (6% of page weight)

Unused JS 440 KB

0.12g unnecessary CO2 per visit

Actual transfer 7214 KB
Theoretical minimum 6773 KB
Potential savings 440 KB (0.12g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Web Font Weight Variants
4 font weights loaded across 1 famil(y/ies) -- reasonable
PASS
4 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
4 font weight(s) loaded across 1 famil(y/ies)
Image Optimization
32 images, 12633 KB total, 11437 KB wasted
INFO

Image Optimization Audit

Total Images

32

Total Size

12633 KB

Oversized

10

Wasted

11437 KB

30 missing alt text 2 missing dimensions 1 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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