https://peerj.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
80
GRADE
B
FIX
0
REVIEW
3
PASS
3
INFO
0
Checks
63 PASS 3 REVIEW
BCO2 Per Page Load0.57g CO2 per viewREVIEW
CO2 Per Page Load
0.57g CO2 per view
0.57g CO2 per view
Info::
0.57g CO2 per page view
This page transfers 2.4 MB, producing an estimated 0.57g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.44g.
Got: 0.57g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 68.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 68.5 kg of CO2 annually — equivalent to charging 8563 smartphones.
Info::
Green hosting reduces data center emissions
0.57g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 53% of websites
Sustainable Web Design model v4 · Page size: 2.4 MB
Your site
0.57g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.12g
End-user device
0.44g
At 10,000 monthly views: Monthly: 5.7 kg · Annual: 68.5 kg · ≈ 8563 smartphone charges
BCarbon Budget47th percentileREVIEW
Carbon Budget
47th percentile
47th percentile
Info::
0.57g CO2 — below the median website (0.60g)
Better than an estimated 53% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 47th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.57g
47th percentile
Cleaner than 53% of websites
✗ Above the median website
vs Median 5% cleaner ✓
vs Target 14% more
CTransfer EfficiencyAction72% efficientREVIEW
Transfer Efficiency
Action72% efficient
72% efficient
Warning::
Transfer efficiency: 72%
An estimated 684 KB (28%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 684 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.
Total waste: 684 KB (28% of page weight)
Unused JS 684 KB
0.16g unnecessary CO2 per visit
Actual transfer 2469 KB
Theoretical minimum 1785 KB
Potential savings 684 KB (0.16g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Hosting✓ Green Hosted
Hosting Cloudflare✓CDN Cloudflare✓
Cloudflare: Verified by the Green Web Foundation
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 10 KB (vs 2469 KB first visit). 58 of 59 resources are served from browser cache, saving 0.57g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.57g)
First visit
2469 KB
Repeat visit
10 KB
100% reduction on repeat visits
Saving 0.57g CO2 per returning visitor
58 resources served from cache · 1 resources re-downloaded
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.