Organisers choose a central theme which attendees are expected to address while at the conference, and in 2020 this is sustainability.

Representing the UK this year was Prince Charles, who focussed his conference speech on delivering the world “from the brink”.

Speaking to attendees, he said it was time to lead the world out of a self-engineered “approaching catastrophe”.

He said: “Do we want to go down in history as the people who did nothing to bring the world back from the brink, in trying to restore the balance, when we could have done? I don’t want to”.