https://vox.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
70
GRADE
C
FIX
2
REVIEW
1
PASS
4
INFO
1
Checks
84 PASS 1 REVIEW 2 FIX
FCO2 Per Page LoadAction8.67g CO2 per viewFIX
CO2 Per Page Load
Action8.67g CO2 per view
8.67g CO2 per view
Critical::
8.67g CO2 per page view
This page transfers 36.6 MB, producing an estimated 8.67g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.22g, network 1.79g, end-user device 6.66g.
Got: 8.67g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 1040.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 1040.4 kg of CO2 annually — equivalent to charging 130054 smartphones.
Info::
Green hosting reduces data center emissions
8.67g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 36.6 MB
Your site
8.67g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.22g
Network
1.79g
End-user device
6.66g
At 10,000 monthly views: Monthly: 86.7 kg · Annual: 1040.4 kg · ≈ 130054 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
8.67g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
8.67g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 1345% more
vs Target 1634% more
BWeb Font Weight VariantsNo detectable Google Fonts weightsREVIEW
Web Font Weight Variants
No detectable Google Fonts weights
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Fastly
Info::
Next.js: Verified by the Green Web Foundation
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 Next.js✓CDN Fastly✓
Next.js: Verified by the Green Web Foundation
Fastly: 100% renewable energy for edge network
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 69 KB (vs 37510 KB first visit). 164 of 169 resources are served from browser cache, saving 8.65g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 8.67g)
First visit
37510 KB
Repeat visit
69 KB
100% reduction on repeat visits
Saving 8.65g CO2 per returning visitor
164 resources served from cache · 5 resources re-downloaded
A+Transfer Efficiency96% efficientPASS
Transfer Efficiency
96% efficient
96% efficient
Info::
Transfer efficiency: 96%
Only 1576 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 1576 KB (4% of page weight)
Unused JS 1576 KB
0.36g unnecessary CO2 per visit
Actual transfer 37510 KB
Theoretical minimum 35934 KB
Potential savings 1576 KB (0.36g CO2)
See Deep Analysis sections above for specific optimizations.
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: Axis12 Ltd
Image Optimization137 images, 0 KB total, 0 KB wastedINFO
Image Optimization
137 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
137
Total Size
0 KB
137 missing dimensions 4 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.