https://adhdreading.org
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
93
GRADE
A
FIX
0
REVIEW
2
PASS
5
INFO
1
Checks
85 PASS 2 REVIEW
BCarbon Budget33th percentileREVIEW
Carbon Budget
33th percentile
33th percentile
Info::
0.44g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 67% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 33th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.44g
33rd percentile
Cleaner than 67% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 27% cleaner ✓
vs Target 13% cleaner ✓
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.
ACO2 Per Page Load0.44g CO2 per viewPASS
CO2 Per Page Load
0.44g CO2 per view
0.44g CO2 per view
Info::
0.44g CO2 per page view
This page transfers 1.8 MB, producing an estimated 0.44g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.09g, end-user device 0.33g.
Got: 0.44g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 52.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 52.3 kg of CO2 annually — equivalent to charging 6539 smartphones.
Info::
Green hosting reduces data center emissions
0.44g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 67% of websites
Sustainable Web Design model v4 · Page size: 1.8 MB
Your site
0.44g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.09g
End-user device
0.33g
At 10,000 monthly views: Monthly: 4.4 kg · Annual: 52.3 kg · ≈ 6539 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Cloudflare
Info::
Next.js: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Next.js✓CDN Cloudflare✓
Next.js: Verified by the Green Web Foundation
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 41 KB (vs 1886 KB first visit). 59 of 60 resources are served from browser cache, saving 0.43g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.44g)
First visit
1886 KB
Repeat visit
41 KB
98% reduction on repeat visits
Saving 0.43g CO2 per returning visitor
59 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency96% efficientPASS
Transfer Efficiency
96% efficient
96% efficient
Info::
Transfer efficiency: 96%
Only 68 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 68 KB (4% of page weight)
Unused JS 68 KB
0.02g unnecessary CO2 per visit
Actual transfer 1886 KB
Theoretical minimum 1817 KB
Potential savings 68 KB (0.02g CO2)
See Deep Analysis sections above for specific optimizations.
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: Cloudflare
Image Optimization37 images, 1183 KB total, 1050 KB wastedINFO
Image Optimization
37 images, 1183 KB total, 1050 KB wasted
Image Optimization Audit
Total Images
37
Total Size
1183 KB
Oversized
5
Wasted
1050 KB
35 missing dimensions 2 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.