https://reddit.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
61
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
82 PASS 2 REVIEW 3 FIX
FCO2 Per Page LoadAction2.42g CO2 per viewFIX
CO2 Per Page Load
Action2.42g CO2 per view
2.42g CO2 per view
Critical::
2.42g CO2 per page view
This page transfers 8.6 MB, producing an estimated 2.42g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.45g, network 0.42g, end-user device 1.56g.
Got: 2.42g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 291.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 291.0 kg of CO2 annually — equivalent to charging 36373 smartphones.
2.42g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 8.6 MB
Your site
2.42g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.45g
Network
0.42g
End-user device
1.56g
At 10,000 monthly views: Monthly: 24.2 kg · Annual: 291.0 kg · ≈ 36373 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 Varnish✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.42g 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
2.42g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 304% more
vs Target 385% 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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 134 KB (vs 8767 KB first visit). 147 of 150 resources are served from browser cache, saving 2.39g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 2.42g)
First visit
8767 KB
Repeat visit
134 KB
98% reduction on repeat visits
Saving 2.39g CO2 per returning visitor
147 resources served from cache · 3 resources re-downloaded
A+Transfer Efficiency90% efficientPASS
Transfer Efficiency
90% efficient
90% efficient
Info::
Transfer efficiency: 90%
Only 847 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 847 KB (10% of page weight)
Unused JS 847 KB
0.23g unnecessary CO2 per visit
Actual transfer 8767 KB
Theoretical minimum 7920 KB
Potential savings 847 KB (0.23g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization1 images, 0 KB total, 0 KB wastedINFO
Image Optimization
1 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
1
Total Size
0 KB
1 missing alt text 1 missing dimensions
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.