We are very many P-worlds. Six billion human-centered ones. But there may be an infinity of p’, p” worlds of which we know nothing. That’s what it is like to be a bat.
[Should we regard arbitrary complex processes as worthy of moral consideration, as we do our own P-worlds? Seems like the only perspective we can possibly take is the one which has our human POV as a reference point. This is the pickle we are in, and this is the only way forward.]