https://arxiv.org
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
96
GRADE
A
FIX
0
REVIEW
2
PASS
4
INFO
0
Checks
64 PASS 2 REVIEW
BRepeat Visit Weight71% cachedREVIEW
Repeat Visit Weight
71% cached
71% cached
Info::
71% reduction on repeat visits
Returning visitors download only 42 KB (vs 144 KB first visit). 13 of 14 resources are served from browser cache, saving 0.02g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.03g)
First visit
144 KB
Repeat visit
42 KB
71% reduction on repeat visits
Saving 0.02g CO2 per returning visitor
13 resources served from cache · 1 resources re-downloaded
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+CO2 Per Page Load0.03g CO2 per viewPASS
CO2 Per Page Load
0.03g CO2 per view
0.03g CO2 per view
Info::
0.03g CO2 per page view
This page transfers 0.1 MB, producing an estimated 0.03g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.01g, end-user device 0.03g.
Got: 0.03g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 4.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 4.0 kg of CO2 annually — equivalent to charging 501 smartphones.
Info::
Green hosting reduces data center emissions
0.03g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.1 MB
Your site
0.03g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.00g
Network
0.01g
End-user device
0.03g
At 10,000 monthly views: Monthly: 0.3 kg · Annual: 4.0 kg · ≈ 501 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Google Cloud, CDN: Fastly
Info::
Google Cloud: Carbon-neutral since 2007, 100% renewable energy matched since 2017
Info::
Fastly: 100% renewable energy for edge network
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 Google Cloud✓CDN Fastly✓
Google Cloud: Carbon-neutral since 2007, 100% renewable energy matched since 2017
Fastly: 100% renewable energy for edge network
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.03g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.03g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 94% cleaner ✓
vs Target 93% cleaner ✓
A+Transfer Efficiency100% efficientPASS
Transfer Efficiency
100% efficient
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
Actual transfer 144 KB
Theoretical minimum 144 KB
See Deep Analysis sections above for specific optimizations.
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.