https://www.youtube.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
76
GRADE
C
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
82 PASS 2 REVIEW 3 FIX
DCO2 Per Page LoadAction0.83g CO2 per viewFIX
CO2 Per Page Load
Action0.83g CO2 per view
0.83g CO2 per view
Info::
0.83g CO2 per page view
This page transfers 3.5 MB, producing an estimated 0.83g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.17g, end-user device 0.64g.
Got: 0.83g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 99.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 99.9 kg of CO2 annually — equivalent to charging 12491 smartphones.
Info::
Green hosting reduces data center emissions
0.83g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 44% of websites
Sustainable Web Design model v4 · Page size: 3.5 MB
Your site
0.83g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.17g
End-user device
0.64g
At 10,000 monthly views: Monthly: 8.3 kg · Annual: 99.9 kg · ≈ 12491 smartphone charges
DCarbon BudgetAction56th percentileFIX
Carbon Budget
Action56th percentile
56th percentile
Warning::
0.83g CO2 — above the median website (0.60g)
Heavier than an estimated 44% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 56th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.83g
56th percentile
Cleaner than 44% of websites
✗ Above the median website
vs Median 39% more
vs Target 67% more
DTransfer EfficiencyAction55% efficientFIX
Transfer Efficiency
Action55% efficient
55% efficient
Warning::
Transfer efficiency: 55%
An estimated 1633 KB (45%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1633 KB of unused JavaScript. This wasted data produces 0.38g of unnecessary CO2 per page view.
Total waste: 1633 KB (45% of page weight)
Unused JS 1633 KB
0.38g unnecessary CO2 per visit
Actual transfer 3602 KB
Theoretical minimum 1969 KB
Potential savings 1633 KB (0.38g CO2)
See Deep Analysis sections above for specific optimizations.
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Google Cloud uses renewable energy
Info::
Google Cloud: Verified by the Green Web Foundation
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 Not identified✗
Google Cloud: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
CWeb Font Weight VariantsAction10 font weights loaded across 3 famil(y/ies)REVIEW
Web Font Weight Variants
Action10 font weights loaded across 3 famil(y/ies)
10 font weights loaded across 3 famil(y/ies)
Warning::
10 font weights loaded -- likely 100+ KB of unused payload
Loading 10 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Roboto, Roboto Mono, YouTube Sans.
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 77 KB (vs 3602 KB first visit). 149 of 151 resources are served from browser cache, saving 0.81g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.83g)
First visit
3602 KB
Repeat visit
77 KB
98% reduction on repeat visits
Saving 0.81g CO2 per returning visitor
149 resources served from cache · 2 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
Image Optimization7 images, 0 KB total, 0 KB wastedINFO
Image Optimization
7 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
7
Total Size
0 KB
7 missing alt text 7 missing dimensions 7 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.