https://yoast.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
91
GRADE
A
FIX
0
REVIEW
1
PASS
6
INFO
1
Checks
86 PASS 1 REVIEW
BTransfer Efficiency78% efficientREVIEW
Transfer Efficiency
78% efficient
78% efficient
Info::
Transfer efficiency: 78%
An estimated 301 KB (22%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 301 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
Total waste: 301 KB (22% of page weight)
Unused JS 301 KB
0.07g unnecessary CO2 per visit
Actual transfer 1400 KB
Theoretical minimum 1098 KB
Potential savings 301 KB (0.07g CO2)
See Deep Analysis sections above for specific optimizations.
ACO2 Per Page Load0.32g CO2 per viewPASS
CO2 Per Page Load
0.32g CO2 per view
0.32g CO2 per view
Info::
0.32g CO2 per page view
This page transfers 1.4 MB, producing an estimated 0.32g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.25g.
Got: 0.32g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 38.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 38.8 kg of CO2 annually — equivalent to charging 4854 smartphones.
Info::
Green hosting reduces data center emissions
0.32g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 78% of websites
Sustainable Web Design model v4 · Page size: 1.4 MB
Your site
0.32g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.07g
End-user device
0.25g
At 10,000 monthly views: Monthly: 3.2 kg · Annual: 38.8 kg · ≈ 4854 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 Weight96% cachedPASS
Repeat Visit Weight
96% cached
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 55 KB (vs 1400 KB first visit). 92 of 95 resources are served from browser cache, saving 0.31g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.32g)
First visit
1400 KB
Repeat visit
55 KB
96% reduction on repeat visits
Saving 0.31g CO2 per returning visitor
92 resources served from cache · 3 resources re-downloaded
ACarbon Budget22th percentilePASS
Carbon Budget
22th percentile
22th percentile
Info::
0.32g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 78% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 22th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.32g
22nd percentile
Cleaner than 78% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 46% cleaner ✓
vs Target 35% cleaner ✓
A+Web Font Weight Variants1 font weights loaded across 1 famil(y/ies) -- reasonablePASS
Web Font Weight Variants
1 font weights loaded across 1 famil(y/ies) -- reasonable
1 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
1 font weight(s) loaded across 1 famil(y/ies)
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 Optimization53 images, 9 KB total, 2 KB wastedINFO
Image Optimization
53 images, 9 KB total, 2 KB wasted
Image Optimization Audit
Total Images
53
Total Size
9 KB
Oversized
2
Wasted
2 KB
46 missing alt text 7 missing dimensions 5 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.