The other day I put up a cartoon about electric cars...
Which reminded me of a couple of others that I've done on the same subject in the past...
I really do hope that we can figure out some great ways to get around that don't involve snarfing enormous amounts of finite resources (oh wait, Europe already did that with trains.) But I think if we get into super-quiet electric motors we'll need to put a little beeper on there or something so people know they're about to get run over in a highly-efficient way.