DiCaprio pledges money for oceans
Leonardo DiCaprio has pledged seven million dollars (£4 million) for marine conservation.
"This isn't simply an exercise in wildlife conservation," the 39-year-old, who admitted that he wanted to be a marine biologist before becoming a movie star, said.
"If we don't do something to save the ocean now, it won't be just the sharks and the dolphins that suffer. It will be our children and our grandchildren."
"I'm standing up here as a concerned citizen of this planet who believes that this is the most important issue of our time."
The Hollywood star called on global leaders t o take action to protect the world's sea creatures.
"My foundation recently announced a three million dollar (£1.77) grant to the organisation Oceana to support their efforts to protect sharks, marine mammals and key ocean habitat in the Eastern Pacific.
"Today, I'm here to commit even more of my foundation's resources to this cause," E! News quoted him as saying. "I'm pledging an additional seven million dollars to meaningful ocean conservation projects over the next two years."
The Leonardo DiCaprio Foundation was launched in 1998. Projects have included the elephant crisis fund, and protecting tigers from extinction and work to save the last rainforests.
In 2007, Leonardo created, produced and narrated documentary film The 11th Hour, on the state of the natural environment.