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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
63
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
8.97g CO2 per view
FIX
8.97g CO2 per view
Critical::
8.97g CO2 per page view
This page transfers 31.7 MB, producing an estimated 8.97g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 1.66g, network 1.55g, end-user device 5.76g.
Got: 8.97g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 1076.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 1076.7 kg of CO2 annually — equivalent to charging 134581 smartphones.

8.97g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 31.7 MB

Your site
8.97g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
1.66g
Network
1.55g
End-user device
5.76g
At 10,000 monthly views: Monthly: 89.7 kg · Annual: 1076.7 kg · ≈ 134581 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::
8.97g 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

8.97g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 1395% more
vs Target 1694% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 62 KB (vs 32441 KB first visit). 101 of 103 resources are served from browser cache, saving 8.95g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 8.97g)
First visit
32441 KB
Repeat visit
62 KB

100% reduction on repeat visits

Saving 8.95g CO2 per returning visitor

101 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 974 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 974 KB (3% of page weight)

Unused JS 974 KB

0.27g unnecessary CO2 per visit

Actual transfer 32441 KB
Theoretical minimum 31467 KB
Potential savings 974 KB (0.27g 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
7 images, 861 KB total, 5 KB wasted
INFO

Image Optimization Audit

Total Images

7

Total Size

861 KB

Oversized

1

Wasted

5 KB

5 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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