Paper money still exist in the future even dihital currency would ve more popular because not all people can have this decentralized currency that is ehy paper money is much usable to them for daily needs.
It depends. If we can promote bitcoin and spread it worldwide then there isn't really much of a use for paper currency, especially when they are issued by a government and costing them so much to issue.
Governments could even move onto cryptocurrencies themselves, to save the printing fees.
i agree with you and promoting crytocurrencies will help our wonderful mother earth to be saved because it will reduced the cutting of trees . because we all know that paper is came from trees and many trees has been cutoff because of producing paper. thats why they recycling the paper to create a paper again but our paper money use special paper which usually different from a normal paper.