Earlier quoted context omitted.
There's value in competition, though. Bitcoin doesn't eliminate trust, but it does commoditize that function. Commoditization necessarily means "many producers", so there's no way to achieve that without duplication of effort - but I guarantee that one Bitcoin ASIC has a lot less environmental impact than one human.
Many producers are actually few with specialised hardware(i.e bitmain)
There's perhaps worries that Bitmain could get too big and poison the chain, but they're hamstrung in that by Bitcoin being an open protocol. If they did that the network would fork, and despite the higher hash rate in the Bitmain fork, holders would dump the Bitmain coins and buy the original fork, since they wouldn't trust the poisoned chain.