https://uol.com.br
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
66
GRADE
D
FIX
3
REVIEW
3
PASS
1
INFO
1
Checks
81 PASS 3 REVIEW 3 FIX
DCO2 Per Page LoadAction1.24g CO2 per viewFIX
CO2 Per Page Load
Action1.24g CO2 per view
1.24g CO2 per view
Warning::
1.24g CO2 per page view
This page transfers 4.4 MB, producing an estimated 1.24g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.23g, network 0.21g, end-user device 0.80g.
Got: 1.24g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 148.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 148.9 kg of CO2 annually — equivalent to charging 18606 smartphones.
1.24g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 32% of websites
Sustainable Web Design model v4 · Page size: 4.4 MB
Your site
1.24g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.23g
Network
0.21g
End-user device
0.80g
At 10,000 monthly views: Monthly: 12.4 kg · Annual: 148.9 kg · ≈ 18606 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 BudgetAction68th percentileFIX
Carbon Budget
Action68th percentile
68th percentile
Warning::
1.24g CO2 — above the median website (0.60g)
Heavier than an estimated 32% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 68th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.24g
68th percentile
Cleaner than 32% of websites
✗ Above the median website
vs Median 107% more
vs Target 148% more
BTransfer Efficiency83% efficientREVIEW
Transfer Efficiency
83% efficient
83% efficient
Info::
Transfer efficiency: 83%
An estimated 745 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 745 KB of unused JavaScript. This wasted data produces 0.21g of unnecessary CO2 per page view.
Total waste: 745 KB (17% of page weight)
Unused JS 745 KB
0.21g unnecessary CO2 per visit
Actual transfer 4485 KB
Theoretical minimum 3739 KB
Potential savings 745 KB (0.21g CO2)
See Deep Analysis sections above for specific optimizations.
CWeb Font Weight VariantsAction23 font weights loaded across 1 famil(y/ies)REVIEW
Web Font Weight Variants
Action23 font weights loaded across 1 famil(y/ies)
23 font weights loaded across 1 famil(y/ies)
Warning::
23 font weights loaded -- likely 100+ KB of unused payload
Loading 23 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Archivo.
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 Weight89% cachedPASS
Repeat Visit Weight
89% cached
89% cached
Info::
89% reduction on repeat visits
Returning visitors download only 484 KB (vs 4485 KB first visit). 246 of 256 resources are served from browser cache, saving 1.11g CO2 per repeat visit.
Info::
Repeat visit: 0.13g CO2 (first visit: 1.24g)
First visit
4485 KB
Repeat visit
484 KB
89% reduction on repeat visits
Saving 1.11g CO2 per returning visitor
246 resources served from cache · 10 resources re-downloaded
Image Optimization200 images, 0 KB total, 0 KB wastedINFO
Image Optimization
200 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
200
Total Size
0 KB
Oversized
3
2 missing alt text 181 missing dimensions 25 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.