 Brian Bethune writes in Maclean's that Knight's logic is "as absurd as it's unassailable". However, he doubts Knight's claim that the last survivors of the human race would have pleasant lives and suspects that a "collective loss of the will to live" would prevail. In response to Knight's platform, journalist Sheldon Richman argues that humans are "active agents" and can change their behavior. He contends that people are capable of solving the problems facing Earth. Alan Weisman, author of The World Without Us, suggests a limit of one child per family as a preferable alternative to abstinence from reproduction.
