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https://flippingbook.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
76
GRADE
C
FIX
1
REVIEW
3
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 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
Repeat Visit Weight
76% cached
REVIEW
76% cached
Info::
76% reduction on repeat visits
Returning visitors download only 254 KB (vs 1039 KB first visit). 84 of 85 resources are served from browser cache, saving 0.22g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 0.29g)
First visit
1039 KB
Repeat visit
254 KB

76% reduction on repeat visits

Saving 0.22g CO2 per returning visitor

84 resources served from cache · 1 resources re-downloaded

B
Transfer Efficiency
88% efficient
REVIEW
88% efficient
Info::
Transfer efficiency: 88%
An estimated 122 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 122 KB of unused JavaScript. This wasted data produces 0.03g of unnecessary CO2 per page view.
88% efficient

Total waste: 122 KB (12% of page weight)

Unused JS 122 KB

0.03g unnecessary CO2 per visit

Actual transfer 1039 KB
Theoretical minimum 917 KB
Potential savings 122 KB (0.03g 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
CO2 Per Page Load
0.29g CO2 per view
PASS
0.29g CO2 per view
Info::
0.29g CO2 per page view
This page transfers 1.0 MB, producing an estimated 0.29g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.05g, end-user device 0.18g.
Got: 0.29g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 34.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 34.5 kg of CO2 annually — equivalent to charging 4313 smartphones.

0.29g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 82% of websites

Sustainable Web Design model v4 · Page size: 1.0 MB

Your site
0.29g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.05g
End-user device
0.18g
At 10,000 monthly views: Monthly: 2.9 kg · Annual: 34.5 kg · ≈ 4313 smartphone charges
A
Carbon Budget
18th percentile
PASS
18th percentile
Info::
0.29g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 82% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 18th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.29g

18th percentile

Cleaner than 82% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 52% cleaner ✓
vs Target 42% cleaner ✓
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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