The blockchain (bitcoin) has actually harmed the environment by using mass amounts of energy. :/
But not necessary that the energy would case any harm to the environment and mainly it's reproducible.Mining processes located in isolated lands may cause noise pollution which can affect the natural habitats of that land but haven't heard of any such cases yet.
True, but how much energy are the competitors using to power their buildings and all those office with the air-conditioning running 24/7 and also the ATM's and the data warehouses and the lights and elevators and CCTV and the energy burnt in fossil fuels to transport money from one location to the next?
That is just like saying "I don't put my garbage in the bin because industrial waste dumped into the oceans is far more worse" - Let the air conditioning run for 24/7 hours.You wouldn't mount 10 more ac's to make things better.