https://moodle.org
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
68
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Checks
63 PASS 1 REVIEW 2 FIX
FCO2 Per Page LoadAction1.66g CO2 per viewFIX
CO2 Per Page Load
Action1.66g CO2 per view
1.66g CO2 per view
Warning::
1.66g CO2 per page view
This page transfers 7.0 MB, producing an estimated 1.66g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.34g, end-user device 1.28g.
Got: 1.66g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 199.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 199.5 kg of CO2 annually — equivalent to charging 24931 smartphones.
Info::
Green hosting reduces data center emissions
1.66g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 20% of websites
Sustainable Web Design model v4 · Page size: 7.0 MB
Your site
1.66g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.04g
Network
0.34g
End-user device
1.28g
At 10,000 monthly views: Monthly: 16.6 kg · Annual: 199.5 kg · ≈ 24931 smartphone charges
FCarbon BudgetAction80th percentileFIX
Carbon Budget
Action80th percentile
80th percentile
Warning::
1.66g CO2 — above the median website (0.60g)
Heavier than an estimated 20% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 80th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.66g
80th percentile
Cleaner than 20% of websites
✗ Above the median website
vs Median 177% more
vs Target 232% more
BTransfer Efficiency89% efficientREVIEW
Transfer Efficiency
89% efficient
89% efficient
Info::
Transfer efficiency: 89%
An estimated 825 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 825 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
Total waste: 825 KB (11% of page weight)
Unused JS 825 KB
0.19g unnecessary CO2 per visit
Actual transfer 7190 KB
Theoretical minimum 6364 KB
Potential savings 825 KB (0.19g 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: 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 Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 17 KB (vs 7190 KB first visit). 77 of 78 resources are served from browser cache, saving 1.66g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.66g)
First visit
7190 KB
Repeat visit
17 KB
100% reduction on repeat visits
Saving 1.66g CO2 per returning visitor
77 resources served from cache · 1 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.