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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
FCO2 Per Page LoadAction3.00g CO2 per viewFIX
CO2 Per Page Load
Action3.00g CO2 per view
3.00g CO2 per view
Critical::
3.00g CO2 per page view
This page transfers 10.6 MB, producing an estimated 3.00g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.56g, network 0.52g, end-user device 1.93g.
Got: 3.00g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 360.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 360.4 kg of CO2 annually — equivalent to charging 45052 smartphones.
3.00g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 10.6 MB
Your site
3.00g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.56g
Network
0.52g
End-user device
1.93g
At 10,000 monthly views: Monthly: 30.0 kg · Annual: 360.4 kg · ≈ 45052 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
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
3.00g 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
3.00g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 401% more
vs Target 501% 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 Weight96% cachedPASS
Repeat Visit Weight
96% cached
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 416 KB (vs 10860 KB first visit). 143 of 145 resources are served from browser cache, saving 2.89g CO2 per repeat visit.
Info::
Repeat visit: 0.12g CO2 (first visit: 3.00g)
First visit
10860 KB
Repeat visit
416 KB
96% reduction on repeat visits
Saving 2.89g CO2 per returning visitor
143 resources served from cache · 2 resources re-downloaded
A+Transfer Efficiency97% efficientPASS
Transfer Efficiency
97% efficient
97% efficient
Info::
Transfer efficiency: 97%
Only 283 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 283 KB (3% of page weight)
Unused JS 283 KB
0.08g unnecessary CO2 per visit
Actual transfer 10860 KB
Theoretical minimum 10576 KB
Potential savings 283 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.