The year is 2020. Billions of people across the globe sit in lockdown as scientists desperately try to find a cure to the pandemic that has brought the world to a standstill. And sustainability – until the pandemic hit, the defining megatrend of our time – is largely pushed out of the headlines. Flights are grounded. Manufacturers shutter their factories. Daily commutes and school runs stop dead, almost overnight. And methane emissions continue to rise.