https://cjr.org
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
69
GRADE
D
FIX
2
REVIEW
0
PASS
4
INFO
0
Checks
64 PASS 2 FIX
FCO2 Per Page LoadAction2.23g CO2 per viewFIX
CO2 Per Page Load
Action2.23g CO2 per view
2.23g CO2 per view
Critical::
2.23g CO2 per page view
This page transfers 9.4 MB, producing an estimated 2.23g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.46g, end-user device 1.72g.
Got: 2.23g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 268.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 268.1 kg of CO2 annually — equivalent to charging 33509 smartphones.
Info::
Green hosting reduces data center emissions
2.23g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 9.4 MB
Your site
2.23g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.06g
Network
0.46g
End-user device
1.72g
At 10,000 monthly views: Monthly: 22.3 kg · Annual: 268.1 kg · ≈ 33509 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.23g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
2.23g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 272% more
vs Target 347% more
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Google Cloud, CDN: Cloudflare
Info::
Google Cloud: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Google Cloud✓CDN Cloudflare✓
Google Cloud: Verified by the Green Web Foundation
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 75 KB (vs 9664 KB first visit). 88 of 91 resources are served from browser cache, saving 2.22g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.23g)
First visit
9664 KB
Repeat visit
75 KB
99% reduction on repeat visits
Saving 2.22g CO2 per returning visitor
88 resources served from cache · 3 resources re-downloaded
A+Transfer Efficiency97% efficientPASS
Transfer Efficiency
97% efficient
97% efficient
Info::
Transfer efficiency: 97%
Only 259 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 259 KB (3% of page weight)
Unused JS 259 KB
0.06g unnecessary CO2 per visit
Actual transfer 9664 KB
Theoretical minimum 9405 KB
Potential savings 259 KB (0.06g 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: Google Cloud
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.