https://ufrj.br
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
84
GRADE
B
FIX
1
REVIEW
1
PASS
4
INFO
0
Checks
64 PASS 1 REVIEW 1 FIX
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
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
ACO2 Per Page Load0.28g CO2 per viewPASS
CO2 Per Page Load
0.28g CO2 per view
0.28g CO2 per view
Info::
0.28g CO2 per page view
This page transfers 1.0 MB, producing an estimated 0.28g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.05g, end-user device 0.18g.
Got: 0.28g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 33.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 33.1 kg of CO2 annually — equivalent to charging 4134 smartphones.
0.28g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 83% of websites
Sustainable Web Design model v4 · Page size: 1.0 MB
Your site
0.28g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.05g
Network
0.05g
End-user device
0.18g
At 10,000 monthly views: Monthly: 2.8 kg · Annual: 33.1 kg · ≈ 4134 smartphone charges
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 15 KB (vs 996 KB first visit). 53 of 54 resources are served from browser cache, saving 0.27g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.28g)
First visit
996 KB
Repeat visit
15 KB
98% reduction on repeat visits
Saving 0.27g CO2 per returning visitor
53 resources served from cache · 1 resources re-downloaded
ACarbon Budget17th percentilePASS
Carbon Budget
17th percentile
17th percentile
Info::
0.28g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 83% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 17th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.28g
17th percentile
Cleaner than 83% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 54% cleaner ✓
vs Target 45% cleaner ✓
A+Transfer Efficiency92% efficientPASS
Transfer Efficiency
92% efficient
92% efficient
Info::
Transfer efficiency: 92%
Only 83 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 83 KB (8% of page weight)
Unused JS 83 KB
0.02g unnecessary CO2 per visit
Actual transfer 996 KB
Theoretical minimum 912 KB
Potential savings 83 KB (0.02g CO2)
See Deep Analysis sections above for specific optimizations.
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.