New Delhi, March 16 -- "We need 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 of underprivileged people who will be most affected, for our children's children, and for those whose voices have been drowned out by the politics of greed."

This passionate call to action by Leonardo DiCaprio didn't come from a podium at a climate summit. It came from the Oscars stage. That choice alone made it one of the most-watched acceptance speeches in Academy Awards history.

Leonardo DiCaprio had one of the world's biggest microphones for 90 seconds. He used it to speak about the planet.

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