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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
81
GRADE
B
FIX
1
REVIEW
3
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 3 REVIEW 1 FIX
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

B
CO2 Per Page Load
0.60g CO2 per view
REVIEW
0.60g CO2 per view
Info::
0.60g CO2 per page view
This page transfers 2.1 MB, producing an estimated 0.60g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.10g, end-user device 0.38g.
Got: 0.60g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 71.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 71.6 kg of CO2 annually — equivalent to charging 8949 smartphones.

0.60g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 51% of websites

Sustainable Web Design model v4 · Page size: 2.1 MB

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

Energy Breakdown

Data center
0.11g
Network
0.10g
End-user device
0.38g
At 10,000 monthly views: Monthly: 6.0 kg · Annual: 71.6 kg · ≈ 8949 smartphone charges
B
Carbon Budget
49th percentile
REVIEW
49th percentile
Info::
0.60g CO2 — below the median website (0.60g)
Better than an estimated 51% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 49th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.60g

49th percentile

Cleaner than 51% of websites

✗ Above the median website

vs Median 1% cleaner ✓
vs Target 19% 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 36 KB (vs 2157 KB first visit). 53 of 54 resources are served from browser cache, saving 0.59g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.60g)
First visit
2157 KB
Repeat visit
36 KB

98% reduction on repeat visits

Saving 0.59g CO2 per returning visitor

53 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 94 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 94 KB (4% of page weight)

Unused JS 94 KB

0.03g unnecessary CO2 per visit

Actual transfer 2157 KB
Theoretical minimum 2062 KB
Potential savings 94 KB (0.03g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Web Font Weight Variants
3 font weights loaded across 3 famil(y/ies) -- reasonable
PASS
3 font weights loaded across 3 famil(y/ies) -- reasonable
Info::
3 font weight(s) loaded across 3 famil(y/ies)
Image Optimization
8 images, 728 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

8

Total Size

728 KB

2 missing dimensions 5 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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