https://nutrition.org
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
76
GRADE
C
FIX
1
REVIEW
2
PASS
3
INFO
0
Checks
63 PASS 2 REVIEW 1 FIX
DTransfer EfficiencyAction51% efficientFIX
Transfer Efficiency
Action51% efficient
51% efficient
Warning::
Transfer efficiency: 51%
An estimated 1189 KB (49%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1189 KB of unused JavaScript. This wasted data produces 0.27g of unnecessary CO2 per page view.
Total waste: 1189 KB (49% of page weight)
Unused JS 1189 KB
0.27g unnecessary CO2 per visit
Actual transfer 2405 KB
Theoretical minimum 1216 KB
Potential savings 1189 KB (0.27g CO2)
See Deep Analysis sections above for specific optimizations.
BCO2 Per Page Load0.56g CO2 per viewREVIEW
CO2 Per Page Load
0.56g CO2 per view
0.56g CO2 per view
Info::
0.56g CO2 per page view
This page transfers 2.3 MB, producing an estimated 0.56g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.43g.
Got: 0.56g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 66.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 66.7 kg of CO2 annually — equivalent to charging 8341 smartphones.
Info::
Green hosting reduces data center emissions
0.56g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 55% of websites
Sustainable Web Design model v4 · Page size: 2.3 MB
Your site
0.56g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.12g
End-user device
0.43g
At 10,000 monthly views: Monthly: 5.6 kg · Annual: 66.7 kg · ≈ 8341 smartphone charges
BCarbon Budget45th percentileREVIEW
Carbon Budget
45th percentile
45th percentile
Info::
0.56g CO2 — below the median website (0.60g)
Better than an estimated 55% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 45th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.56g
45th percentile
Cleaner than 55% of websites
✗ Above the median website
vs Median 7% cleaner ✓
vs Target 11% more
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudways, CDN: Cloudflare
Info::
Cloudways: 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 Cloudways✓CDN Cloudflare✓
Cloudways: 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 87 KB (vs 2405 KB first visit). 116 of 121 resources are served from browser cache, saving 0.54g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.56g)
First visit
2405 KB
Repeat visit
87 KB
96% reduction on repeat visits
Saving 0.54g CO2 per returning visitor
116 resources served from cache · 5 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: Cloudflare
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.