Scenario: A charity wants to use Bitcoin (PoW) for international donations because it's the most recognized and trusted cryptocurrency. A donor objects, citing environmental concerns. 

Questions: 

1. What are the trade-offs between Bitcoin's brand recognition/security and its environmental impact? 
2. Could the charity use Lightning Network (Bitcoin Layer 2) to reduce per-transaction energy? 
3. Would switching to a PoS chain (like Ethereum or Celo) be better – even if less recognized? 

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