https://www.medium.com
Sustainability
· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
83
GRADE
B
FIX
1
REVIEW
1
PASS
5
INFO
0
Checks
75 PASS 1 REVIEW 1 FIX
DTransfer EfficiencyAction47% efficientFIX
Transfer Efficiency
Action47% efficient
47% efficient
Critical::
Transfer efficiency: 47%
An estimated 859 KB (53%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 859 KB of unused JavaScript. This wasted data produces 0.20g of unnecessary CO2 per page view.
Total waste: 859 KB (53% of page weight)
Unused JS 859 KB
0.20g unnecessary CO2 per visit
Actual transfer 1627 KB
Theoretical minimum 767 KB
Potential savings 859 KB (0.20g CO2)
See Deep Analysis sections above for specific optimizations.
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 Load0.38g CO2 per viewPASS
CO2 Per Page Load
0.38g CO2 per view
0.38g CO2 per view
Info::
0.38g CO2 per page view
This page transfers 1.6 MB, producing an estimated 0.38g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.29g.
Got: 0.38g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 45.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 45.1 kg of CO2 annually — equivalent to charging 5642 smartphones.
Info::
Green hosting reduces data center emissions
0.38g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 73% of websites
Sustainable Web Design model v4 · Page size: 1.6 MB
Your site
0.38g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.08g
End-user device
0.29g
At 10,000 monthly views: Monthly: 3.8 kg · Annual: 45.1 kg · ≈ 5642 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: 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 Cloudflare✓CDN Cloudflare✓
Cloudflare: 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 Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 42 KB (vs 1627 KB first visit). 34 of 36 resources are served from browser cache, saving 0.37g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.38g)
First visit
1627 KB
Repeat visit
42 KB
97% reduction on repeat visits
Saving 0.37g CO2 per returning visitor
34 resources served from cache · 2 resources re-downloaded
ACarbon Budget27th percentilePASS
Carbon Budget
27th percentile
27th percentile
Info::
0.38g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 73% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 27th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.38g
27th percentile
Cleaner than 73% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 37% cleaner ✓
vs Target 25% cleaner ✓
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
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.