https://improvingliteracy.org
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
78
GRADE
C
FIX
1
REVIEW
3
PASS
3
INFO
1
Checks
83 PASS 3 REVIEW 1 FIX
DCarbon BudgetAction52th percentileFIX
Carbon Budget
Action52th percentile
52th percentile
Warning::
0.67g CO2 — above the median website (0.60g)
Heavier than an estimated 48% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 52th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.67g
52nd percentile
Cleaner than 48% of websites
✗ Above the median website
vs Median 12% more
vs Target 35% more
BCO2 Per Page Load0.67g CO2 per viewREVIEW
CO2 Per Page Load
0.67g CO2 per view
0.67g CO2 per view
Info::
0.67g CO2 per page view
This page transfers 2.8 MB, producing an estimated 0.67g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.14g, end-user device 0.52g.
Got: 0.67g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 80.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 80.9 kg of CO2 annually — equivalent to charging 10108 smartphones.
Info::
Green hosting reduces data center emissions
0.67g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 48% of websites
Sustainable Web Design model v4 · Page size: 2.8 MB
Your site
0.67g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.14g
End-user device
0.52g
At 10,000 monthly views: Monthly: 6.7 kg · Annual: 80.9 kg · ≈ 10108 smartphone charges
CTransfer EfficiencyAction71% efficientREVIEW
Transfer Efficiency
Action71% efficient
71% efficient
Warning::
Transfer efficiency: 71%
An estimated 849 KB (29%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 849 KB of unused JavaScript. This wasted data produces 0.20g of unnecessary CO2 per page view.
Total waste: 849 KB (29% of page weight)
Unused JS 849 KB
0.20g unnecessary CO2 per visit
Actual transfer 2915 KB
Theoretical minimum 2065 KB
Potential savings 849 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.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Kinsta, CDN: Cloudflare
Info::
Kinsta: 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 Kinsta✓CDN Cloudflare✓
Kinsta: 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 56 KB (vs 2915 KB first visit). 59 of 62 resources are served from browser cache, saving 0.66g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.67g)
First visit
2915 KB
Repeat visit
56 KB
98% reduction on repeat visits
Saving 0.66g CO2 per returning visitor
59 resources served from cache · 3 resources re-downloaded
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: Something Familiar
Image Optimization16 images, 215 KB total, 1 KB wastedINFO
Image Optimization
16 images, 215 KB total, 1 KB wasted
Image Optimization Audit
Total Images
16
Total Size
215 KB
Oversized
1
Wasted
1 KB
9 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.