https://videojs.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
84
GRADE
B
FIX
0
REVIEW
3
PASS
3
INFO
0
Checks
63 PASS 3 REVIEW
BCO2 Per Page Load0.51g CO2 per viewREVIEW
CO2 Per Page Load
0.51g CO2 per view
0.51g CO2 per view
Info::
0.51g CO2 per page view
This page transfers 2.1 MB, producing an estimated 0.51g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.10g, end-user device 0.39g.
Got: 0.51g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 60.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 60.6 kg of CO2 annually — equivalent to charging 7580 smartphones.
Info::
Green hosting reduces data center emissions
0.51g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 60% of websites
Sustainable Web Design model v4 · Page size: 2.1 MB
Your site
0.51g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.10g
End-user device
0.39g
At 10,000 monthly views: Monthly: 5.1 kg · Annual: 60.6 kg · ≈ 7580 smartphone charges
BCarbon Budget40th percentileREVIEW
Carbon Budget
40th percentile
40th percentile
Info::
0.51g CO2 — below the median website (0.60g)
Better than an estimated 60% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 40th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.51g
40th percentile
Cleaner than 60% of websites
✗ Above the median website
vs Median 16% cleaner ✓
vs Target 1% more
BTransfer Efficiency86% efficientREVIEW
Transfer Efficiency
86% efficient
86% efficient
Info::
Transfer efficiency: 86%
An estimated 305 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 305 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
Total waste: 305 KB (14% of page weight)
Unused JS 305 KB
0.07g unnecessary CO2 per visit
Actual transfer 2186 KB
Theoretical minimum 1881 KB
Potential savings 305 KB (0.07g 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: Google Cloud, CDN: Netlify
Info::
Google Cloud: Verified by the Green Web Foundation
Info::
Netlify: Hosted on AWS/Google Cloud with renewable energy matching
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 Netlify✓
Google Cloud: Verified by the Green Web Foundation
Netlify: Hosted on AWS/Google Cloud with renewable energy matching
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight95% cachedPASS
Repeat Visit Weight
95% cached
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 113 KB (vs 2186 KB first visit). 135 of 136 resources are served from browser cache, saving 0.48g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.51g)
First visit
2186 KB
Repeat visit
113 KB
95% reduction on repeat visits
Saving 0.48g CO2 per returning visitor
135 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: Google Cloud
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.