https://arthritis.org
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
68
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Checks
63 PASS 1 REVIEW 2 FIX
FCO2 Per Page LoadAction1.72g CO2 per viewFIX
CO2 Per Page Load
Action1.72g CO2 per view
1.72g CO2 per view
Warning::
1.72g CO2 per page view
This page transfers 7.3 MB, producing an estimated 1.72g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.36g, end-user device 1.32g.
Got: 1.72g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 206.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 206.6 kg of CO2 annually — equivalent to charging 25830 smartphones.
Info::
Green hosting reduces data center emissions
1.72g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 18% of websites
Sustainable Web Design model v4 · Page size: 7.3 MB
Your site
1.72g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.04g
Network
0.36g
End-user device
1.32g
At 10,000 monthly views: Monthly: 17.2 kg · Annual: 206.6 kg · ≈ 25830 smartphone charges
FCarbon BudgetAction82th percentileFIX
Carbon Budget
Action82th percentile
82th percentile
Warning::
1.72g CO2 — above the median website (0.60g)
Heavier than an estimated 18% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 82th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.72g
82nd percentile
Cleaner than 18% of websites
✗ Above the median website
vs Median 187% more
vs Target 244% more
BTransfer Efficiency81% efficientREVIEW
Transfer Efficiency
81% efficient
81% efficient
Info::
Transfer efficiency: 81%
An estimated 1433 KB (19%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1433 KB of unused JavaScript. This wasted data produces 0.33g of unnecessary CO2 per page view.
Total waste: 1433 KB (19% of page weight)
Unused JS 1433 KB
0.33g unnecessary CO2 per visit
Actual transfer 7450 KB
Theoretical minimum 6016 KB
Potential savings 1433 KB (0.33g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: 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 Cloudflare✓CDN Cloudflare✓
Cloudflare: 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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 121 KB (vs 7450 KB first visit). 164 of 169 resources are served from browser cache, saving 1.69g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.72g)
First visit
7450 KB
Repeat visit
121 KB
98% reduction on repeat visits
Saving 1.69g CO2 per returning visitor
164 resources served from cache · 5 resources re-downloaded
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: Cloudflare
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.