https://iol.co.za
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
2
REVIEW
1
PASS
3
INFO
0
Checks
63 PASS 1 REVIEW 2 FIX
DCO2 Per Page LoadAction1.21g CO2 per viewFIX
CO2 Per Page Load
Action1.21g CO2 per view
1.21g CO2 per view
Warning::
1.21g CO2 per page view
This page transfers 5.1 MB, producing an estimated 1.21g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.25g, end-user device 0.93g.
Got: 1.21g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 145.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 145.4 kg of CO2 annually — equivalent to charging 18178 smartphones.
Info::
Green hosting reduces data center emissions
1.21g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 33% of websites
Sustainable Web Design model v4 · Page size: 5.1 MB
Your site
1.21g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.25g
End-user device
0.93g
At 10,000 monthly views: Monthly: 12.1 kg · Annual: 145.4 kg · ≈ 18178 smartphone charges
DCarbon BudgetAction67th percentileFIX
Carbon Budget
Action67th percentile
67th percentile
Warning::
1.21g CO2 — above the median website (0.60g)
Heavier than an estimated 33% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 67th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.21g
67th percentile
Cleaner than 33% of websites
✗ Above the median website
vs Median 102% more
vs Target 142% more
BTransfer Efficiency82% efficientREVIEW
Transfer Efficiency
82% efficient
82% efficient
Info::
Transfer efficiency: 82%
An estimated 921 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 921 KB of unused JavaScript. This wasted data produces 0.21g of unnecessary CO2 per page view.
Total waste: 921 KB (18% of page weight)
Unused JS 921 KB
0.21g unnecessary CO2 per visit
Actual transfer 5243 KB
Theoretical minimum 4321 KB
Potential savings 921 KB (0.21g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Next.js, CDN: Cloudflare
Info::
Next.js: 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 Next.js✓CDN Cloudflare✓
Next.js: 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 Weight93% cachedPASS
Repeat Visit Weight
93% cached
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 384 KB (vs 5243 KB first visit). 264 of 275 resources are served from browser cache, saving 1.12g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 1.21g)
First visit
5243 KB
Repeat visit
384 KB
93% reduction on repeat visits
Saving 1.12g CO2 per returning visitor
264 resources served from cache · 11 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.