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 BudgetAction53th percentileFIX
Carbon Budget
Action53th percentile
53th percentile
Warning::
0.73g CO2 — above the median website (0.60g)
Heavier than an estimated 47% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 53th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.73g
53rd percentile
Cleaner than 47% of websites
✗ Above the median website
vs Median 21% more
vs Target 45% more
BCO2 Per Page Load0.73g CO2 per viewREVIEW
CO2 Per Page Load
0.73g CO2 per view
0.73g CO2 per view
Info::
0.73g CO2 per page view
This page transfers 3.1 MB, producing an estimated 0.73g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.15g, end-user device 0.56g.
Got: 0.73g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 87.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 87.1 kg of CO2 annually — equivalent to charging 10882 smartphones.
Info::
Green hosting reduces data center emissions
0.73g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 47% of websites
Sustainable Web Design model v4 · Page size: 3.1 MB
Your site
0.73g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.15g
End-user device
0.56g
At 10,000 monthly views: Monthly: 7.3 kg · Annual: 87.1 kg · ≈ 10882 smartphone charges
CTransfer EfficiencyAction73% efficientREVIEW
Transfer Efficiency
Action73% efficient
73% efficient
Warning::
Transfer efficiency: 73%
An estimated 844 KB (27%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 844 KB of unused JavaScript. This wasted data produces 0.20g of unnecessary CO2 per page view.
Total waste: 844 KB (27% of page weight)
Unused JS 844 KB
0.20g unnecessary CO2 per visit
Actual transfer 3138 KB
Theoretical minimum 2293 KB
Potential savings 844 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 3138 KB first visit). 62 of 65 resources are served from browser cache, saving 0.71g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.73g)
First visit
3138 KB
Repeat visit
56 KB
98% reduction on repeat visits
Saving 0.71g CO2 per returning visitor
62 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, 271 KB total, 1 KB wastedINFO
Image Optimization
16 images, 271 KB total, 1 KB wasted
Image Optimization Audit
Total Images
16
Total Size
271 KB
Oversized
1
Wasted
1 KB
12 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.