The actor and environmental activist has lined up several celebrities in an attempt to change America's policy on pollution and climate restoration, according to Teen Hollywood.
DiCaprio has filmed an online video urging the public to lobby politicians, who will vote on a bill called the Clean Energy, Jobs and American Power Act , which aims to cut US reliance on foreign oil supplies and the use of sustainable energy sources.
Other actors recruited for the video campaign include Felicity Huffman, Justin Long and Emmy Rossum, who all address viewers in the 'This Is Our Moment' campaign.
The 35-year-old said: "There is a bill in the United States Senate that we need to pay attention to. Everyone as a nation. We're going to be watching all you senators, very closely."