Peter Singer wrote an essay in 1972 that changed the course of his life. He asked whether we should care about people more just because they're closer to us. David Frum says he's never heard a compelling counter-argument for this idea. But it seems practical limitations get in the way far before philosophical question kicks in, he says.
If the human race lasts as long as a typical mammalian species and our population continues at its current size, then there are 80 trillion people yet to come. Oxford philosophy professor William MacAskill says it's up to us to protect them.
In his bold new book, "What We Owe the Future," MacAskill makes a case for longtermism. He believes that how long we survive as a species may depend on the actions we take now.
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