I don't get it. People have been sending messages before the internet as well?

And surely people enjoyed a meal before mastering use of fire, so what good is technology anyway?

There are more efficient, less environmentally-damaging technologies that should be used instead.

"On the current trajectory, Bitcoin miners will surpass coal miners as a major contributor to greenhouse emissions."

source: https://www.sfchronicle.com/opinion/openforum/article/Bitcoi...

Yes, for energy production. GPUs do not have a CO2 byproduct.

Yes, and with a far smaller carbon footprint than blockchain-based messaging.