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Actor and UN Messenger of Peace Leonardo DiCaprio takes the podium to speak during the Climate Summit at United Nations Headquarters in New York Puma Creepers Velvet Bordeaux Rabais , on September 23, 2014. Photo: CFP
Climate change may be the challenge of our time, but when it comes to rallying the global public to the cause, a Hollywood star will always trump a treaty or summit.


Environmental threats loom large in many an American blockbuster, as in this year's Mad Max about the fight for access to water, or Interstellar Puma Creepers Velvet Grise En ligne , featuring a group of astronauts who leave an Earth made uninhabitable by plagues and sandstorms to seek a new planet.


A star-studded documentary series called Years of Living Dangerously, co-produced by James Cameron, tackles climate change and the melting of the polar ice caps head-on, with a second season slated for next year.


But for much of the glitterati, the battle is fought off screen, calling for action on social media Femme Fenty Puma BOW Sneaker Rose Pas Cher , demonstrating in the street or lending their faces to ad campaigns.


Tinseltown's unofficial chief ambassador on climate is Leonardo DiCaprio, who in 2014 was named a UN messenger of peace.


Last year he opened a summit on climate change at the United Nations with a stark warning: "None of it is hysteria. It is a fact."


"This is not a partisan debate. It is a human one. It is our moral obligation - if, admittedly, a daunting one," added the star of Titanic and The Wolf of Wall Street.


DiCaprio, who will attend the COP21 climate change talks in Paris next month Femme Fenty Puma BOW Olive Verte Pas Cher , has been crusading on global warming since 1998, when he founded the Leonardo DiCaprio Foundation, which is involved in 78 projects and raised $40 million at its last event.


His 2007 documentary The 11th Hour blares his message loud and clear: deforestation and pollution are destroying the ecosystems that guarantee the survival of species.


DiCaprio is far from alone in the fight.


Matt Damon has led a high-profile campaign against deforestation and