What about the environmental impact of traditional payment networks? Setting up a bank account, getting monthly paper bills and promotions, the cost of hiring a human being to support your questions about their horrendous UI... it adds up quickly, bitcoin or not.
Do you know that printing of all the paper money in circulation around the world resulted in the destruction of a huge amount of forest? And paper money needs to be replaced every 5-6 years, while Bitcoins don't need replacement. Coins that are mined once remain in circulation for ever. That is unless the private key is lost for some reason.