https://hachettebookgroup.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
66
GRADE
D
FIX
2
REVIEW
3
PASS
1
INFO
0
Checks
61 PASS 3 REVIEW 2 FIX
DGreen HostingActionUnknownFIX
Green Hosting
ActionUnknown
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
DCarbon BudgetAction54th percentileFIX
Carbon Budget
Action54th percentile
54th percentile
Warning::
0.76g CO2 — above the median website (0.60g)
Heavier than an estimated 46% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 54th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.76g
54th percentile
Cleaner than 46% of websites
✗ Above the median website
vs Median 27% more
vs Target 52% more
BCO2 Per Page Load0.76g CO2 per viewREVIEW
CO2 Per Page Load
0.76g CO2 per view
0.76g CO2 per view
Info::
0.76g CO2 per page view
This page transfers 2.7 MB, producing an estimated 0.76g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.14g, network 0.13g, end-user device 0.49g.
Got: 0.76g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 91.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 91.1 kg of CO2 annually — equivalent to charging 11392 smartphones.
0.76g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 46% of websites
Sustainable Web Design model v4 · Page size: 2.7 MB
Your site
0.76g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.14g
Network
0.13g
End-user device
0.49g
At 10,000 monthly views: Monthly: 7.6 kg · Annual: 91.1 kg · ≈ 11392 smartphone charges
CTransfer EfficiencyAction75% efficientREVIEW
Transfer Efficiency
Action75% efficient
75% efficient
Warning::
Transfer efficiency: 75%
An estimated 698 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 698 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
Total waste: 698 KB (25% of page weight)
Unused JS 698 KB
0.19g unnecessary CO2 per visit
Actual transfer 2746 KB
Theoretical minimum 2047 KB
Potential savings 698 KB (0.19g CO2)
See Deep Analysis sections above for specific optimizations.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Repeat Visit Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 95 KB (vs 2746 KB first visit). 149 of 151 resources are served from browser cache, saving 0.73g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.76g)
First visit
2746 KB
Repeat visit
95 KB
97% reduction on repeat visits
Saving 0.73g CO2 per returning visitor
149 resources served from cache · 2 resources re-downloaded
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.