When Covid swept across the globe, the impact was arguably greater than the aftermath of 9/11 or the global financial crisis. But out of catastrophe can come a new way of thinking.Former UK Prime Minister Gordon Brown offers his solutions to the challenges we face in 2021 and beyond, outlining seven challenges: global health, climate change, nuclear proliferation, global financial instability, the humanitarian crisis and global poverty, the barriers to education and opportunity, and global inequality and global tax havens.None of these can be solved by one nation acting on its own, but all can be addressed if we work together as a global community.

Hugh Muir is Senior Assistant Editor at the Guardian