It's often been reported that Matthew turned down Leonardo DiCaprio's role, but he's insisted that's "not factual".
The Hollywood actor, who is an environmental campaigner himself, said Greta's message should be a "wake-up call to world leaders".
And how a fearless British reporter helped uncover it.
An inside look at one of 2019's best films.
Margot Robbie Joins Brad Pitt and Leonardo DiCaprio At Dazzling Once Upon A Time In Hollywood Premiere
The Quentin Tarantino film features the Charles Manson murders of 1969.
With a three-minute standing ovation at the Cannes Film Festival, Quentin Tarantino’s ninth feature film stars Leonardo DiCaprio, Brad Pitt, Margot Robbie and is set to be an all-time great.
“I will miss him everyday. Every minute. Every second.”
Stalking, death threats and numerous criminal charges: My investigation into environmental corruption quickly became the unravelling of the Malaysian government — at great personal cost
'I think we both had a specific opinion about each other...'
The Quentin Tarantino-directed film could be one of his last.