The pandemic, climate change and peacekeeping are all priorities for the UN in 2021, but these challenges require multilateral solutions at a time when the world's superpowers are drifting further apart. Gideon Rachman talks to António Guterres, secretary-general of the UN, about bridging security and military divides to solve pressing global problems.  Review clips: World Economic Forum See acast.com/privacy for privacy and opt-out information.