https://usatf.org
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 LoadAction5.25g CO2 per viewFIX
CO2 Per Page Load
Action5.25g CO2 per view
5.25g CO2 per view
Critical::
5.25g CO2 per page view
This page transfers 18.6 MB, producing an estimated 5.25g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.97g, network 0.91g, end-user device 3.37g.
Got: 5.25g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 630.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 630.6 kg of CO2 annually — equivalent to charging 78824 smartphones.
5.25g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 18.6 MB
Your site
5.25g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.97g
Network
0.91g
End-user device
3.37g
At 10,000 monthly views: Monthly: 52.5 kg · Annual: 630.6 kg · ≈ 78824 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::
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 Not identified✗CDN Sucuri✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
5.25g 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
5.25g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 776% more
vs Target 951% 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 Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 42 KB (vs 19001 KB first visit). 192 of 193 resources are served from browser cache, saving 5.24g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 5.25g)
First visit
19001 KB
Repeat visit
42 KB
100% reduction on repeat visits
Saving 5.24g CO2 per returning visitor
192 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency96% efficientPASS
Transfer Efficiency
96% efficient
96% efficient
Info::
Transfer efficiency: 96%
Only 722 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 722 KB (4% of page weight)
Unused JS 722 KB
0.20g unnecessary CO2 per visit
Actual transfer 19001 KB
Theoretical minimum 18278 KB
Potential savings 722 KB (0.20g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization59 images, 13730 KB total, 215 KB wastedINFO
Image Optimization
59 images, 13730 KB total, 215 KB wasted
Image Optimization Audit
Total Images
59
Total Size
13730 KB
Oversized
15
Wasted
215 KB
34 missing alt text 59 missing dimensions 57 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.