how would you reply?

For energy you think seriously that bitcoin don't use more energy than the credit card actual system? Learn about cryptography; learn about the actual system then we will speak another time. I m an expert in it... I will explain you something in this comment.

For the divisibility, if BTC comes to be use for 5% of the world wealth 65 trillion $ it we be above 154 millions dollar/BTC, 65 000 000 000 000 000 * 0.05 / 21 000 000 = 154 000 000$ but you will not be able to trade by 1.5$ step (1 satochi) it s insufficient divisible... If half of the world wealth enter in BTC it will be 15$ steps... It miss 4 or 5 zero or units more... It s not so well thinked...

Than the big difference with precious metals is that BTC have an open register, and you can know how many BTC are in a wallet just with the wallet address... Crazy?! Yes for long distance transaction is interesting but not for saving and less and less for daily transaction... That make a useful price of BTC between 3000 to 5000$, down the energy cost for mining, so... RIP

BTC today is the typical image of an absurd comportement autodestructor...

There is more and more problem but you can't say what you just say. Make the calculation by yourself with the hashrate for the enormous BTC electric consumption just today, than think. There is different cryptocurrencies and many are less efficient than BTC using a ton of electric power for nothing... (a part of 2.0 Ponzy sheme)

Listen that please :

Bank use few cryptography because they have their own intranet. And you know why? Why they didn't use cryptography? Why did they build an intranet for them? Because cryptography use too many energy!!!! They knows it! BTC technology isn't new!!!

For me cryptography is a nuclear button of internet. It can destroy it. But one thing is sure, Cryptography is destroying our real world for any utility.

Stop walls (cryptography) and make bridges (open source). Interne tis a virtual world we don't need walls or money in it, we need to understand it. Internet is like a universal and free library it have to be free. If printing machine was kept in the church hands for Bible our world will be really different no? Crypto and internet is near the same. Don't change internet for an undispensable monster it's just a library, not a selling place or publicity medium...

To finish, many transaction are artificials to keep the appearance... How it s possible that more than 10% of all the bitcoin have moved today??? It s like this every days...

I have more and more exemple if you want...