UH-HUH. SURE.

Sir David Attenborough made a surprise appearance ... at Glastonbury [England] to thank ... the festival for going "plastic free" as he introduced his new BBC documentary One Planet, Seven Worlds.

He told the crowd: "There was one sequence in Blue Planet II which everyone seems to remember.

"It had an extraordinary effect and now this great festival has gone plastic-free.

"That is more than a million bottles of water have not been drunk by you in plastic. Thank you."

Organisers had previously urged those attending to bring sturdy tents and return home with them, instead of dumping them at the end of the event.

In an interview with the Glastonbury Free Press on Sunday, Emily Eavis said: "We've made so many positive strides with our green campaigns this year.

Somehow I don't think the attendees got the message.

UPDATE: Litterfest 2019.