OK, but do you see any harm from it? Of course, it eats much electricity and virtual resources, but the influence is not so great in reality. meanwhile, some bloggers have their own viewpoint: https://www.youtube.com/watch?v=mo-n2-E4X0M
Btc's requirements doesn't really have a direct effect, if it has an effect at all. Electricity can be harnessed through renewable energy if that's what you're concerned about. And there are even alts and icos that focus on the environment as well.