https://torproject.org
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
90
GRADE
A
FIX
0
REVIEW
1
PASS
5
INFO
0
Checks
65 PASS 1 REVIEW
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Apache HTTP Server uses renewable energy
Info::
Apache HTTP Server: 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 Apache HTTP Server✓CDN Not identified✗
Apache HTTP Server: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
ACO2 Per Page Load0.35g CO2 per viewPASS
CO2 Per Page Load
0.35g CO2 per view
0.35g CO2 per view
Info::
0.35g CO2 per page view
This page transfers 1.5 MB, producing an estimated 0.35g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.27g.
Got: 0.35g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 41.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 41.8 kg of CO2 annually — equivalent to charging 5225 smartphones.
Info::
Green hosting reduces data center emissions
0.35g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 76% of websites
Sustainable Web Design model v4 · Page size: 1.5 MB
Your site
0.35g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.07g
End-user device
0.27g
At 10,000 monthly views: Monthly: 3.5 kg · Annual: 41.8 kg · ≈ 5225 smartphone charges
A+Repeat Visit Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 5 KB (vs 1507 KB first visit). 32 of 33 resources are served from browser cache, saving 0.35g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.35g)
First visit
1507 KB
Repeat visit
5 KB
100% reduction on repeat visits
Saving 0.35g CO2 per returning visitor
32 resources served from cache · 1 resources re-downloaded
ACarbon Budget24th percentilePASS
Carbon Budget
24th percentile
24th percentile
Info::
0.35g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 76% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 24th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.35g
24th percentile
Cleaner than 76% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 42% cleaner ✓
vs Target 30% cleaner ✓
A+Transfer Efficiency93% efficientPASS
Transfer Efficiency
93% efficient
93% efficient
Info::
Transfer efficiency: 93%
Only 109 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 109 KB (7% of page weight)
Unused JS 109 KB
0.03g unnecessary CO2 per visit
Actual transfer 1507 KB
Theoretical minimum 1397 KB
Potential savings 109 KB (0.03g CO2)
See Deep Analysis sections above for specific optimizations.
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: Hetzner Online GmbH
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.