Philosopher William MacAskill: ‘The world is a darker place than it was just five years ago’

Can we save the world one small act at a time? From veganism to the 'do-gooder' mindset, in this interview with the prophet of 'Effective Altruism' William MacAskill, Gillian Tett discovers why we shouldn't be passive in the face of threats like climate change and instead take practical and rational action to improve the world around us.