Speaking of the pollution, this is what I get when installing electrum on gentoo (well, it is calculate linux really, but same source basically):
* Messages for package net-misc/electrum-4.4.3: * If you are new to BitCoin, please be aware that: * 1. Cryptocurrencies are volatile. BTC has been subject to rapid * changes of value in the past. * 2. Cryptocurrency ownership is determined solely by the access to * the private key. If the key is lost or stolen, BTC are unrevocably * lost. * 3. Proof-of-work based cryptocurrencies have negative environmental * impact. BTC mining is consuming huge amounts of electricity.