Leonardo DiCaprio has at long last won his first Oscar for survival epic The Revenant, after six designations.

He was named best performing artist at the 88th Academy Awards, with Brie Larson named best on-screen character for Room."

Climate change is real - it is happening right now," said DiCaprio. "It is the most urgent threat facing our species, and we need to work collectively together and stop procrastinating."

He asked the audience to "support leaders around the world who do not speak for the big polluters or the big corporations but who speak for all of humanity, for the indigenous people of the world, for the billions and billions of underprivileged people who'll be affected by this".

He added: "Let us not take this planet for granted. I do not take tonight for granted."