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Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
60
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
82 PASS 2 REVIEW 3 FIX
DCO2 Per Page LoadAction1.28g CO2 per viewFIX
CO2 Per Page Load
Action1.28g CO2 per view
1.28g CO2 per view
Warning::
1.28g CO2 per page view
This page transfers 4.5 MB, producing an estimated 1.28g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.24g, network 0.22g, end-user device 0.82g.
Got: 1.28g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 153.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 153.6 kg of CO2 annually — equivalent to charging 19206 smartphones.
1.28g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 31% of websites
Sustainable Web Design model v4 · Page size: 4.5 MB
Your site
1.28g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.24g
Network
0.22g
End-user device
0.82g
At 10,000 monthly views: Monthly: 12.8 kg · Annual: 153.6 kg · ≈ 19206 smartphone charges
DGreen HostingActionNot greenFIX
Green Hosting
ActionNot green
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
Info::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 HostingNot Green Hosted
Hosting AWS✗CDN AWS CloudFront✗
AWS: Renewable energy varies by region; committed to 100% by 2025
AWS CloudFront: Renewable varies by edge location
Based on known provider commitments. Verify at thegreenwebfoundation.org
DCarbon BudgetAction69th percentileFIX
Carbon Budget
Action69th percentile
69th percentile
Warning::
1.28g CO2 — above the median website (0.60g)
Heavier than an estimated 31% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 69th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.28g
69th percentile
Cleaner than 31% of websites
✗ Above the median website
vs Median 113% more
vs Target 156% 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.
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+Repeat Visit Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 155 KB (vs 4629 KB first visit). 174 of 176 resources are served from browser cache, saving 1.24g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 1.28g)
First visit
4629 KB
Repeat visit
155 KB
97% reduction on repeat visits
Saving 1.24g CO2 per returning visitor
174 resources served from cache · 2 resources re-downloaded
A+Transfer Efficiency94% efficientPASS
Transfer Efficiency
94% efficient
94% efficient
Info::
Transfer efficiency: 94%
Only 293 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 293 KB (6% of page weight)
Unused JS 293 KB
0.08g unnecessary CO2 per visit
Actual transfer 4629 KB
Theoretical minimum 4336 KB
Potential savings 293 KB (0.08g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization74 images, 1037 KB total, 0 KB wastedINFO
Image Optimization
74 images, 1037 KB total, 0 KB wasted
Image Optimization Audit
Total Images
74
Total Size
1037 KB
1 missing alt text 60 missing dimensions 64 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.