First watch this vid.
https://www.youtube.com/watch?v=3LSBZtL_sLsCrypto is incentivising people to destroy the planet.
At the moment the world is focused on getting rid of plastic, I'd say crypto is what we need to get rid of next.
If your crypto isn't green it's going to be taken out and shot. If your favourite coins don't destroy the plane they might have a future.
Your post shows a lack of understanding of the fundamental science behind cryptocurrencies. Crypto has nothing to do with destroying the environment. And by "destroying the planet", I'm guessing you mean all the energy that goes into mining Bitcoin and other proof of work based cryptocurrencies. Bitcoin and several other cryptos use proof of work, which requires a huge amount of power. But, that is not a property of cryptocurrencies in general, that was one implementation to make the network more secure. In the future, cryptocurrencies will adapt to be more energy efficient, and that is already happening. Thus, your post is not considering advances in technology.
He is crazy. Should we all stop driving cars too? Do you know how much damage cars do? Mining cryptocurrency doesn't use any more electricity then driving to the shops and paying in fiat. People seem to forget that banks use servers too they just not called miners and they work differently. Every single online transfer or trasnfer from your credit card all goes online and there has to be server computers to process this and they are owned by banks. Instead of that we have miners that can be used by anyone and not just the banks like the banks server computers are all private and controlled.
On a global scale mining is not a problem in the slightest. The OP should fight other causes.... Perhaps use hemp and solar power to power your mining rigs?