Vaclav Smil responds: My essay apparently hit the target, the target being the categorists
who know that the end (of oil, and hence of civilization as we know it) is near and will be dismal.
But when these categorists
reach thirty-five, they usually change it to forty, just as they did when they reached thirty when thirty was that fine line.
Those who copy Fido must be dogmatists, categorists
, absolutists, "know-alls".