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https://videojs.org

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
81
GRADE
B
FIX
0
REVIEW
4
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 4 REVIEW
B
CO2 Per Page Load
0.51g CO2 per view
REVIEW
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 7578 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 · ≈ 7578 smartphone charges
B
Carbon Budget
40th percentile
REVIEW
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
B
Transfer Efficiency
86% efficient
REVIEW
86% efficient
Info::
Transfer efficiency: 86%
An estimated 304 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 304 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
86% efficient

Total waste: 304 KB (14% of page weight)

Unused JS 304 KB

0.07g unnecessary CO2 per visit

Actual transfer 2185 KB
Theoretical minimum 1881 KB
Potential savings 304 KB (0.07g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Netlify CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
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 Not identified✗CDN Netlify✓

Netlify: Hosted on AWS/Google Cloud with renewable energy matching

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 113 KB (vs 2185 KB first visit). 134 of 135 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
2185 KB
Repeat visit
113 KB

95% reduction on repeat visits

Saving 0.48g CO2 per returning visitor

134 resources served from cache · 1 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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