https://tucson.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
58
GRADE
D
FIX
4
REVIEW
1
PASS
1
INFO
0
Checks
61 PASS 1 REVIEW 4 FIX
DCO2 Per Page LoadAction0.92g CO2 per viewFIX
CO2 Per Page Load
Action0.92g CO2 per view
0.92g CO2 per view
Info::
0.92g CO2 per page view
This page transfers 3.3 MB, producing an estimated 0.92g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.17g, network 0.16g, end-user device 0.59g.
Got: 0.92g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 110.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 110.7 kg of CO2 annually — equivalent to charging 13836 smartphones.
0.92g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 41% of websites
Sustainable Web Design model v4 · Page size: 3.3 MB
Your site
0.92g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.17g
Network
0.16g
End-user device
0.59g
At 10,000 monthly views: Monthly: 9.2 kg · Annual: 110.7 kg · ≈ 13836 smartphone charges
DGreen HostingActionUnknownFIX
Green Hosting
ActionUnknown
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
DCarbon BudgetAction59th percentileFIX
Carbon Budget
Action59th percentile
59th percentile
Warning::
0.92g CO2 — above the median website (0.60g)
Heavier than an estimated 41% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 59th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.92g
59th percentile
Cleaner than 41% of websites
✗ Above the median website
vs Median 54% more
vs Target 84% more
DTransfer EfficiencyAction60% efficientFIX
Transfer Efficiency
Action60% efficient
60% efficient
Warning::
Transfer efficiency: 60%
An estimated 1340 KB (40%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1340 KB of unused JavaScript. This wasted data produces 0.37g of unnecessary CO2 per page view.
Total waste: 1340 KB (40% of page weight)
Unused JS 1340 KB
0.37g unnecessary CO2 per visit
Actual transfer 3335 KB
Theoretical minimum 1994 KB
Potential savings 1340 KB (0.37g CO2)
See Deep Analysis sections above for specific optimizations.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Repeat Visit Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 83 KB (vs 3335 KB first visit). 152 of 156 resources are served from browser cache, saving 0.90g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.92g)
First visit
3335 KB
Repeat visit
83 KB
97% reduction on repeat visits
Saving 0.90g CO2 per returning visitor
152 resources served from cache · 4 resources re-downloaded
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.