https://redhat.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
79
GRADE
C
FIX
1
REVIEW
2
PASS
3
INFO
0
Checks
63 PASS 2 REVIEW 1 FIX
DGreen HostingActionNot greenFIX
Green Hosting
ActionNot green
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Apache HTTP Server✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
BCarbon Budget38th percentileREVIEW
Carbon Budget
38th percentile
38th percentile
Info::
0.48g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 62% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 38th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.48g
38th percentile
Cleaner than 62% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 20% cleaner ✓
vs Target 4% cleaner ✓
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 Load0.48g CO2 per viewPASS
CO2 Per Page Load
0.48g CO2 per view
0.48g CO2 per view
Info::
0.48g CO2 per page view
This page transfers 1.7 MB, producing an estimated 0.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.08g, end-user device 0.31g.
Got: 0.48g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 57.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 57.6 kg of CO2 annually — equivalent to charging 7201 smartphones.
0.48g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 62% of websites
Sustainable Web Design model v4 · Page size: 1.7 MB
Your site
0.48g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.09g
Network
0.08g
End-user device
0.31g
At 10,000 monthly views: Monthly: 4.8 kg · Annual: 57.6 kg · ≈ 7201 smartphone charges
A+Repeat Visit Weight95% cachedPASS
Repeat Visit Weight
95% cached
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 95 KB (vs 1735 KB first visit). 118 of 122 resources are served from browser cache, saving 0.45g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.48g)
First visit
1735 KB
Repeat visit
95 KB
95% reduction on repeat visits
Saving 0.45g CO2 per returning visitor
118 resources served from cache · 4 resources re-downloaded
A+Transfer Efficiency98% efficientPASS
Transfer Efficiency
98% efficient
98% efficient
Info::
Transfer efficiency: 98%
Only 32 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 32 KB (2% of page weight)
Unused JS 32 KB
0.01g unnecessary CO2 per visit
Actual transfer 1735 KB
Theoretical minimum 1703 KB
Potential savings 32 KB (0.01g 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.