Even if it were politics (which I don't think this is), what would we loose by upping our overall energy efficency and reducing our reliance on fossil energy (p

Even if it were politics (which I don't think this is), what would we loose by upping our overall energy efficency and reducing our reliance on fossil energy (plus be more considerate of nature etc.)? I have never really thought about it, so I'm really curious about your thoughts, but as a cynical I would guess we only "loose" our coziness because it would require change which we humans seem to don't like.