https://colab.research.google.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
64
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Checks
62 PASS 1 REVIEW 3 FIX
DCO2 Per Page LoadAction1.15g CO2 per viewFIX
CO2 Per Page Load
Action1.15g CO2 per view
1.15g CO2 per view
Warning::
1.15g CO2 per page view
This page transfers 4.9 MB, producing an estimated 1.15g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.24g, end-user device 0.88g.
Got: 1.15g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 137.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 137.8 kg of CO2 annually — equivalent to charging 17220 smartphones.
Info::
Green hosting reduces data center emissions
1.15g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 35% of websites
Sustainable Web Design model v4 · Page size: 4.9 MB
Your site
1.15g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.24g
End-user device
0.88g
At 10,000 monthly views: Monthly: 11.5 kg · Annual: 137.8 kg · ≈ 17220 smartphone charges
DCarbon BudgetAction65th percentileFIX
Carbon Budget
Action65th percentile
65th percentile
Warning::
1.15g CO2 — above the median website (0.60g)
Heavier than an estimated 35% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 65th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.15g
65th percentile
Cleaner than 35% of websites
✗ Above the median website
vs Median 91% more
vs Target 130% more
DTransfer EfficiencyAction53% efficientFIX
Transfer Efficiency
Action53% efficient
53% efficient
Warning::
Transfer efficiency: 53%
An estimated 2334 KB (47%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2334 KB of unused JavaScript. This wasted data produces 0.54g of unnecessary CO2 per page view.
Total waste: 2334 KB (47% of page weight)
Unused JS 2334 KB
0.54g unnecessary CO2 per visit
Actual transfer 4966 KB
Theoretical minimum 2632 KB
Potential savings 2334 KB (0.54g CO2)
See Deep Analysis sections above for specific optimizations.
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
TornadoServer uses renewable energy
Info::
TornadoServer: Verified by the Green Web Foundation
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 TornadoServer✓CDN Not identified✗
TornadoServer: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 54 KB (vs 4966 KB first visit). 65 of 71 resources are served from browser cache, saving 1.14g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.15g)
First visit
4966 KB
Repeat visit
54 KB
99% reduction on repeat visits
Saving 1.14g CO2 per returning visitor
65 resources served from cache · 6 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: Google Cloud
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.