https://wonderhowto.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
72
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Checks
63 PASS 1 REVIEW 2 FIX
DCO2 Per Page LoadAction0.97g CO2 per viewFIX
CO2 Per Page Load
Action0.97g CO2 per view
0.97g CO2 per view
Info::
0.97g CO2 per page view
This page transfers 4.1 MB, producing an estimated 0.97g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.20g, end-user device 0.74g.
Got: 0.97g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 116.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 116.1 kg of CO2 annually — equivalent to charging 14514 smartphones.
Info::
Green hosting reduces data center emissions
0.97g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 40% of websites
Sustainable Web Design model v4 · Page size: 4.1 MB
Your site
0.97g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.20g
End-user device
0.74g
At 10,000 monthly views: Monthly: 9.7 kg · Annual: 116.1 kg · ≈ 14514 smartphone charges
DCarbon BudgetAction60th percentileFIX
Carbon Budget
Action60th percentile
60th percentile
Warning::
0.97g CO2 — above the median website (0.60g)
Heavier than an estimated 40% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 60th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.97g
60th percentile
Cleaner than 40% of websites
✗ Above the median website
vs Median 61% more
vs Target 94% more
CTransfer EfficiencyAction66% efficientREVIEW
Transfer Efficiency
Action66% efficient
66% efficient
Warning::
Transfer efficiency: 66%
An estimated 1402 KB (34%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1402 KB of unused JavaScript. This wasted data produces 0.32g of unnecessary CO2 per page view.
Total waste: 1402 KB (34% of page weight)
Unused JS 1402 KB
0.32g unnecessary CO2 per visit
Actual transfer 4186 KB
Theoretical minimum 2783 KB
Potential savings 1402 KB (0.32g 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 71 KB (vs 4186 KB first visit). 231 of 233 resources are served from browser cache, saving 0.95g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.97g)
First visit
4186 KB
Repeat visit
71 KB
98% reduction on repeat visits
Saving 0.95g CO2 per returning visitor
231 resources served from cache · 2 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.