Asteroids, weapons of mass destruction, supervolcanoes, future pandemics, ecological collapse and wars – these are things we do not want to imagine but there are people that prepare humanity for them. In this episode, host Jonathan Samuels speaks to Dr Charity Dean, chief executive and founder of The Public Health Company; Jens Orback, executive director of the Global Challenges Organisation; and Richard Atwood, interim president of the International Crisis Group.