What are the greatest global threats to humanity? Are we on the verge of our own unexpected extinction?
An international team of scientists, mathematicians and philosophers at Oxford University's Future of Humanity Institute is investigating the biggest dangers.
And they argue in a research paper, Existential Risk as a Global Priority, that international policymakers must pay serious attention to the reality of species-obliterating risks.
Last year there were more academic papers published on snowboarding than human extinction.
The Swedish-born director of the institute, Nick Bostrom, says the stakes couldn't be higher. If we get it wrong, this could be humanity's final century.