https://theconversation.com
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
2
PASS
4
INFO
0
Checks
64 PASS 2 REVIEW
BTransfer Efficiency84% efficientREVIEW
Transfer Efficiency
84% efficient
84% efficient
Info::
Transfer efficiency: 84%
An estimated 200 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 200 KB of unused JavaScript. This wasted data produces 0.05g of unnecessary CO2 per page view.
Total waste: 200 KB (16% of page weight)
Unused JS 200 KB
0.05g unnecessary CO2 per visit
Actual transfer 1291 KB
Theoretical minimum 1090 KB
Potential savings 200 KB (0.05g CO2)
See Deep Analysis sections above for specific optimizations.
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 Load0.30g CO2 per viewPASS
CO2 Per Page Load
0.30g CO2 per view
0.30g CO2 per view
Info::
0.30g CO2 per page view
This page transfers 1.3 MB, producing an estimated 0.30g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.06g, end-user device 0.23g.
Got: 0.30g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 35.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 35.8 kg of CO2 annually — equivalent to charging 4478 smartphones.
Info::
Green hosting reduces data center emissions
0.30g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 81% of websites
Sustainable Web Design model v4 · Page size: 1.3 MB
Your site
0.30g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.06g
End-user device
0.23g
At 10,000 monthly views: Monthly: 3.0 kg · Annual: 35.8 kg · ≈ 4478 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Google Cloud, CDN: Fastly
Info::
Google Cloud: Carbon-neutral since 2007, 100% renewable energy matched since 2017
Info::
Fastly: 100% renewable energy for edge network
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 Fastly✓
Google Cloud: Carbon-neutral since 2007, 100% renewable energy matched since 2017
Fastly: 100% renewable energy for edge network
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight93% cachedPASS
Repeat Visit Weight
93% cached
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 93 KB (vs 1291 KB first visit). 121 of 122 resources are served from browser cache, saving 0.28g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.30g)
First visit
1291 KB
Repeat visit
93 KB
93% reduction on repeat visits
Saving 0.28g CO2 per returning visitor
121 resources served from cache · 1 resources re-downloaded
ACarbon Budget19th percentilePASS
Carbon Budget
19th percentile
19th percentile
Info::
0.30g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 81% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 19th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.30g
19th percentile
Cleaner than 81% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 50% cleaner ✓
vs Target 40% cleaner ✓
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.