Addressing the conference through a video message after being told to rest for several weeks, the Queen urged world leaders to step up and save our "fragile" planet for future generations.
Prime minister Boris Johnson, though, has attracted criticism after it was revealed he plans to fly back to London from Glasgow on a private aircraft instead of taking a train.
Elsewhere, the travel industry has continued to gain “momentum” as Covid-19 restrictions are lifted and bookings increase, according to Tui, although holidaymakers aged over 70 are facing higher prices for their travel insurance, according to new research.